[Edward Tinker]

you must be in the military, as you don't have a first name~!

From the FAQ on this forum, although for a byf42, I am sure a byf 41 would be the same. Frank will correct me if I am wrong;

13) Proper Grips on a BYF 42?

Either wood or black bakelite grips would be proper on your byf 42. If you remove the grips, be very careful when you remove the left grip as it is very easy to chip the upper rear corner behind the safety. The grips should, but not always, have an eagle/135 stamp on them and, perhaps, the last 2 digits of the serial #. Again, the grips were not always stamped. If there is an eagle acceptance stamp that is not 135 or numbers that do not match the last two digits of the serial # on your gun, the grips were not issued with your pistol and are replacements. If they are stamped with only a 42 then the are, no doubt, armourers (sp) replacements.

Almost all of the byf 42's have the last two digits on the inside of the wood grips and almost all of them have the eagle 135 acceptance proof. In fact, it would be the exception to find an original issued byf 42 rig that did not have the last two digits and the eagle 135 proof on them, or at least one of them.

Ed