What is this?

[Niki427]

Many years back I found this device. The circumstances and/or surroundings at the time had med convinced it had some connection or relation to a firearm, but I can't remember what those circumstances and/or surroundings were Does anyone have a clue on what it might be, or does anyone recognize the CA part of the number? Any suggestion is welcome. (It's about 1/8" thick and flat)

 

[SDC]

It's a wrench used to hold the barrel of the M1917 water-cooled Browning when changing parts; http://www.bmgparts.com/tools.html

 

[Niki427]

Amazing! Thanks!