Ithaca Variations

*The following information in the description of the variations of M1911A1 pistols was obtained from "Colt .45 Service Pistols Models of 1911 and 1911A1", by Charles W. Clawson and in part from my own observations.

 

Serial Number

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Description

No. 859526

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Manufactured by Ithaca in 1943 with a reclaimed W.W.I Colt receiver with the heart shaped cutouts under the grips. 6200 reclaimed W.W.I receivers were acquired by Ithaca from Springfield Armory to help with early production delays. Found from serial number 856405 to about serial number 870000 and can identified by the "H" (Frank Hosmer provisional inspection mark) at the 12 o’clock position to the disconnector hole on the top of the receiver. About 50% of these receivers will have the heart shaped cutouts under the grips and the other 50% will not. Ithaca produced receivers can be found intermixed in this serial number range and are identified by their crude appearance with rough tool marks and misshape trigger guards for example. This pistol was arsenal re-worked at Augusta Arsenal. Note the small "AA" on the left side of the receiver forward of the slide stop. "FJA" inspector’s mark on right receiver for Colonel Frank J. Atwood. All Ithaca pistols inspected by "FJA". The "P" on the slide and receiver are proof marks stamped with the same die after the pistol was proof fired. The P's should be the same on the slide and receiver, and if they are not, then the slide and receiver are mismatched.

No. 864149

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Another pistol with a reclaimed W.W.I receiver without the heart shaped cut outs beneath the grips. Note the bluish colored Du-lite finish which is a Type III black oxide bluing process done over a sandblasted surface. This finish is found from serial number 856405 to about serial number 900000. Also notice the rough tool marks on the slide which were characteristic of early Ithaca production. After the pistol was blued or parkerized, the bullet ramp of the receiver was machined, not polished, which left it bright unfinished with fine machining marks. This procedure was performed on Ithaca's total production.

No. 870978

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1943 production with Colt W.W.II receiver and a Du-lite blued finish over a sand blasted surface. Ithaca bought 7,000 new W.W.II receivers from Colt in late 1942 early 1943 to aid in Ithaca's production delays. These W.W.II Colt receivers can be differentiated from the Ithaca receivers by the Ithaca receiver's crude appearance with rough tool marks and misshaped trigger guards.

No. 889910

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One of the first Ithaca pistols with a parkerized finish which was a Type II or phosphate process. Note the misshaped trigger guard which is another characteristic of early Ithaca production. Also note the serrated slide stop and thumb lock safety, serrated small parts can be found after about serial number 880000. Ithaca pistols can be found with serrated slide stops, hammers, thumb lock safeties, and mainspring housings.

No. 906753

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To aid in Ithaca’s production delays, replacement slides identified by the "M1911A1 U.S. ARMY" stamped on the right side of the slide were used in regular production. These can be found from about serial number 904000 to about the 1208674 range. Both Colt, Remington Rand, and Union Switch and Signal produced replacement slides with the "M1911A1 U.S. ARMY" on the right side. These were made from 1938 to mid 1943. But Ithaca Gun Co. was the only company to use them in regular production. These slides found on pistols of another manufacturer besides Ithaca Gun Co. signifies that the slide has been replaced.

No. 1238916*

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Early 1944 production shipped to the Property Ordnance Officer, Supply Division, Office of Strategic Services, Fowler Building, Rossyln, VA on 1/11/44 in a shipment of 5000 pistols. No special markings noted on pistol to designate it OSS property. Note the large lettering style of the serial number found in the low 1200000 serial number range.

No. 1270724

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Produced 1944 and shipped to the Officer in Charge, Naval Supply Depot, Oakland, California on March 27, 1944 in a shipment of 5000 pistols. The Navy received 29,900 pistols from Ithaca Gun Co. during WWII. This pistol was issued to Lt. Micheal S. Bales who was a dentist in the USN and stationed on the island of Guam from 1944-45.

No. 1466955

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Produced 1944 and shipped to the Ordnance Property Officer, Army Air Base, Kearney, Nebraska, in a shipment of 1850 pistols on June 3, 1944.

No. 1860462

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1944 production with the Flaming Bomb final inspection mark found on Ithaca’s in the barrel channel of the receiver and behind the firing pin stop plate on the slide. This mark signified complete inspection of components by Ordnance Department inspectors and was an added inspection before final inspection due to Ithaca’s high rate of rejected pistols. This mark is found from serial number 856405 to about 1279673 and found intermittently to the end of production.

No. 2075739

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1944 production shipped to War Shipping Administration c/o British Ministry of War Transport Pier 97, North River New York, N.Y. on October 21, 1944 in a shipment of 1250 pistols. Note the pre-1955 Birmingham Proof House marks.

No. 2659666

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Produced late 1945 at the end of production just before Ithaca's contract with the government was canceled on August 15, 1945. Last pistol produced by Ithaca was serial number 2660318. This pistol was in the last shipment from Ithaca Gun Company to the government and was shipped to the Transportation Officer, Raritan Ordnance Depot, Nixon, NJ on September 7, 1945 in a shipment of 4004 pistols. Ithaca produced a total of 335,466 pistols during W.W.II

Shipping Box

Side

Top

Pistols were packed in this type of box with two spare wrapped magazines and were then packed 50 to a crate for shipping to their destination. Note the nomenclature in violet ink on the lid and the different configuration of this box when compared to the Remington Rand box.

Barrels

HS

SP

F

Colt

Normally found with High Standard "HS" marked barrels on the right lug. Some "Colt" marked barrels on the left lug and Springfield Armory "S P" marked barrels on the right lug found during early production. Also, some Flannery " F" marked barrels on the right lug found during late production.

Grips

Early Keyes

Later Keyes

Ithaca used plastic grips made by Keyes Fibre Co. Both styles have on the inside the strengthening ribs and the "K" inside the 5 pointed star. Early style without reinforcing rings around screw holes and later grips with reinforcing rings around screw holes. Date or serial number not known when the transition was from early to later style grips.

Magazines

WWII Contractors

Full blued tube with spot welded base, and the top of the lip of the base marked: " L " M.S. Little Mfg. Co. , " R " Risdon Mfg. Co. , " S " Scovill Mfg. Co.. Ithaca pistols were issued only with these three types of magazines.