Two model 51 pistols - Picture

[rsv1rem]

Please help me with the approximate build date of these two model 51 pistols pictured here with my Remington model 8 rifles. Serial numbers are 177XX and 418XX. Both are in .380 caliber. Thanks

[Jay Huber]

The 17xxx pistol is an early model with the nine wide slide serrations and was made in 1919 the second year of production. The 41xxx was made in 1923 and has the later slide serration design. Jay Huber RSA