You're gonna have to give more information, either the model or the thread size, pitch, screw length, head dimensions.
Get the serial number from the bottom of the barrels or frame, look up this number in the list at the link below "Other Useful Information ". That should get you to a model and date of mfr.
Thank you Chuck!
Got me to the root of the problem: I didn't know the difference between a Flues, Crass and Manier. Turns out it's a 1903 Crass; s/n: 82072. Numrich shows the stock tang screw as Sold Out but at least I now know what I seek.
Cheers,
Hoot
