How To Identify An Ithaca Double Barrel Shotgun: The Complete Collector's Authentication Guide

To identify an Ithaca double barrel shotgun, you must cross-reference the serial number found on the water table and barrel flats with historical production records to determine the specific model era, ranging from the early Baker to the robust New Ithaca Double (NID). Identification hinges on recognizing specific frame silhouettes, cocking mechanisms, and engraving patterns that distinguish the six major design evolutions manufactured between 1883 and 1948. Precise authentication involves verifying the gauge, barrel steel type—such as Damascus or Nitro—and the aesthetic grade which dictates the firearm’s historical and market value.

Essential Tools and Documentation for Ithaca Authentication

Before attempting to classify an Ithaca side-by-side, it is necessary to gather the proper equipment and historical context. Unlike modern mass-produced firearms, Ithaca’s early manufacturing involved hand-fitting and overlapping production periods where parts from previous models might appear on transitional pieces. Proper identification requires a keen eye for metallurgical signatures and mechanical nuances.

• Magnification and Lighting: A 10x jeweler’s loupe and a high-lumen LED flashlight are essential for reading faint serial numbers on the water table or identifying the fine "cloverleaf" patterns on Damascus barrels.
• Precision Calipers: Used to measure the bore diameter and chamber length. Many vintage Ithacas were chambered for 2 1/2-inch or 2 9/16-inch shells rather than the modern 2 3/4-inch standard.
• Historical Serial Number Tables: Access to the Ithaca Gun Company’s archival serial number lists is required to correlate the five- or six-digit stamps with the specific year of manufacture.
• Reference Catalogues: Copies of original Ithaca sales literature from 1883 through 1948 help identify the specific engraving "Grades" (ranging from Field Grade to the prestigious Sousa Grade).
• Safety Gear: Nitrile gloves prevent skin oils from reacting with vintage bluing or case coloring during the inspection of high-condition specimens.

Systematic Protocol for Identifying Ithaca Side-by-Side Models

Identifying an Ithaca double barrel is a process of elimination that begins with the serial number and moves through the mechanical architecture of the receiver. Each era of production—defined by the lead designer or a specific nomenclature—has a unique "face" and internal lock geometry.

Step 1: Locate and Record the Serial Number

The primary serial number is almost always located on the "water table," which is the flat part of the receiver frame revealed when the barrels are removed. To find this, push the top lever to the right and pivot the barrels downward until they detach from the hinge pin.

1. Inspect the water table (frame flats) for a stamped five- or six-digit number.
2. Check the "barrel flats" (the underside of the barrels that rest against the water table) to ensure the numbers match the frame.
3. Examine the wood-to-metal fit on the inside of the forearm iron; the serial number is typically stamped there as well.
4. Record any prefix or suffix letters. For example, an "S" suffix often denotes a "Special" or trap configuration, while a "2" might indicate the grade.

Pro-Tip: If the serial numbers on the frame, barrels, and forearm do not match, the shotgun is considered a "parts gun," which significantly impacts its collector value and potentially its safety.

Step 2: Differentiate the Six Major Model Eras

Ithaca produced six distinct "models" of their double barrel shotgun. Identifying which one you have is largely a matter of looking at the frame design and the year associated with your serial number.

1. The Baker Model (1883–1887): These are the earliest Ithacas. They are easily identified by their external hammers or "hammerless" designs that still utilize a very square, boxy frame. Look for the "Ithaca Gun Co." name stamped on the side plates.
2. The Crass Model (1888–1903): Named after designer William Crass, this was Ithaca’s first truly successful hammerless boxlock. It is characterized by a "cocking indicator" on the side of the frame—a small pointer that moves when the gun is cocked.
3. The Lewis Model (1901–1906): Designed by Chester Lewis, this model eliminated the cocking indicators. The frame is more rounded than the Crass, and it features a massive lug that engages with the top lever, known as a "triple-bolt" system.
4. The Minier Model (1906–1908): This had the shortest production run. It is identified by its unique coil spring mechanism and a very distinct "V" shape where the stock meets the back of the receiver.
5. The Flues Model (1908–1926): Designed by Emil Flues, this is the most common Ithaca double. It was designed to be lightweight and sleek. The easiest way to identify a Flues is by the serial number (approx. 175,000 to 398,000) and the relatively thin walls of the frame.
6. The New Ithaca Double / NID (1925–1948): The NID was a complete redesign to handle the higher pressures of "modern" smokeless powder. It is identified by its thicker frame, the presence of a "star" stamped on the water table (on many specimens), and serial numbers starting around 425,000.

Step 3: Identify the Grade and Engraving Pattern

Ithaca utilized a numerical grading system to denote the quality of the wood and the complexity of the engraving. Identifying the grade is vital for valuation.

1. Field Grade: The most basic workhorse. It usually features a simple roll-stamped "Ithaca Gun Co." on the side and a scene of a pointer dog or a bird. The wood is plain walnut with minimal checking.
2. Grade 1 through 3: These intermediate grades feature increasingly complex hand-cut engraving. A Grade 2 will typically have more floral scrollwork than a Grade 1.
3. Grade 4 and Above: These are high-art firearms. Grade 4 Ithacas often feature gold inlays and highly figured "Circassian" or "French" walnut.
4. The Sousa Grade: Named after John Philip Sousa (an avid trapshooter and Ithaca fan), this is the pinnacle of Ithaca craftsmanship, featuring extensive gold work and the highest quality wood available in the early 20th century.

Step 4: Analyze Barrel Material and Proof Marks

The barrels provide critical clues regarding the age and intended use of the shotgun. Inspect the top rib and the underside of the barrels near the lug.

1. Damascus/Twist Steel: If the barrels show a visible "watered" or "braided" pattern, they are made of laminated steel. These were common on models prior to the NID.
2. Nitro Steel: If the barrels are smooth, dark blue/black and stamped "Nitro Powder Proved," they were designed for smokeless powder.
3. Choke Markings: Look for numbers like 1, 2, 3, or 4 stamped on the flats. In Ithaca’s system, 4 is usually Full Choke, 3 is Improved Modified, 2 is Modified, and 1 is Improved Cylinder.

Warning: Never fire modern "high-brass" or steel shot through an Ithaca with Damascus barrels. The laminated layers can delaminate under high pressure, leading to catastrophic barrel failure. Even Nitro-proven Flues models should be checked by a gunsmith, as they were designed for lower-pressure shells than those sold in stores today.

Comparative Specifications of Ithaca Double Barrel Models

The following table outlines the technical transition of the Ithaca side-by-side lineage, providing a reference for serial number ranges and key mechanical features used in identification.

Common Identification Obstacles and Historical Anomalies

Identifying a vintage Ithaca is not always straightforward due to factory repairs, custom orders, and the passage of time. Collectors often encounter "transition guns" that do not perfectly fit the standard model descriptions.

• Mismatched Serial Numbers on Forearm

  
  
  
  • Root Cause: The original forearm was likely lost or broken, and a replacement from a different Ithaca was fitted by a previous owner or a gunsmith.
  • Actionable Fix: The frame serial number remains the legal and primary identifier. Check the "iron" (the metal part of the forearm) for signs of re-stamping or grinding, which indicates a non-factory replacement.

• Indistinct Model Features (Transition Specimens)

  
  
  
  • Root Cause: During model transitions (e.g., from Lewis to Minier), Ithaca often used leftover frames from the previous model while incorporating the internal lockwork of the new model.
  • Actionable Fix: Prioritize the internal mechanical design and the serial number over external aesthetics. Consult the Ithaca Gun Company archives or the Ithaca Collectors Association for specific "out-of-sequence" serial number verification.

• Faint or Missing Engraving on "Field Grade" Models

  
  
  
  • Root Cause: Heavy use or aggressive cleaning with abrasive materials has worn down the shallow roll-stamping used on entry-level models.
  • Actionable Fix: Use a high-angle light source (side-lighting) to reveal the shadows of the original stamps. If the metal is completely smooth, look for the serial number on the water table; the absence of "Grade" numbers usually defaults the identification to a Field Grade.

• Damascus Barrels on a Late-Model Frame

  
  
  
  • Root Cause: A customer specifically ordered a higher-end NID or Flues with "old-fashioned" Damascus barrels for aesthetic reasons, even after steel became the standard.
  • Actionable Fix: Verify the serial number on the barrels matches the frame. If they match, it is a rare factory-original configuration. If they do not match, the barrels were likely fitted later, which may pose a significant headspace and safety risk.

Frequently Asked Questions

How can I tell if my Ithaca is a "Flues" or an "NID"?

The most reliable method is checking the serial number; Flues models generally fall between 175,000 and 398,000, while NIDs start around 425,000. Mechanically, the NID has a much thicker, more robust frame and a rotary bolt locking mechanism, whereas the Flues is notably more slender and was prone to frame cracking if used with heavy modern loads.

Where is the grade of the shotgun marked?

On most Ithaca doubles, the grade is stamped on the water table (frame flats) near the serial number. You may see a "F" for Field Grade, or a number like 1, 2, or 3. If no number is present and the gun has very simple engravings, it is almost certainly a Field Grade.

Are Ithaca double barrel shotguns safe to shoot?

Safety depends entirely on the model and the barrel type. Damascus-barreled guns should only be fired with black powder or specialized low-pressure shells, if at all, after a thorough inspection by a vintage-firearms specialist. NID models are generally safe for modern 2 3/4-inch lead loads, provided the chambers haven't been modified and the lockup is tight.

What does the "S" suffix in an Ithaca serial number mean?

In the Ithaca nomenclature, the "S" suffix often denotes a "Special" configuration, frequently seen on single-barrel trap guns or double barrels specifically ordered with non-standard features like ventilated ribs or specialized stock dimensions. It indicates a firearm that deviated from the standard catalog specifications of that era.

How do I identify a "Lefever" Ithaca?

In 1916, Ithaca purchased the Lefever Arms Company. If your shotgun says "Lefever Arms Co." but the serial number or frame looks like an Ithaca, it is likely a "Lefever Nitro Special." These were simplified versions of Ithaca designs produced to compete in the budget market and are identified by their own distinct serial number sequences (often starting with a '1' or '2' prefix).

Secure Your Historical Investment

Identifying an Ithaca double barrel shotgun is the first step in preserving a significant piece of American firearms history. Once you have authenticated the model and grade of your Ithaca, consider obtaining a factory letter from the Ithaca Gun Company archives to formally document its provenance and original shipping configuration.