This Remington manufactured hammer (tumbler) screw is for the model 1889 hammer double shotgun and is in very good condition with light wear. (file photo)

Note: Remington model 1889 hammer double shotguns with the following serial numbers have been observed with this part: 56222, 78283, 82913, 218727 & 242825

Note:  I have been told that this hammer screw has a 440 Whitworth thread which would make sense as to why it is so difficult to find.