I have a presample M/45 (not an M/45b) that needs some work. It needs the stock latch replaced and the current stock does not have the rubber cheek piece. I have a stock latch, spare stock and a bunch of original rivets. The gun is a painted on grey finish that is kind of spotty. Since changing the stock and/or repairing the stock latch will require removing and replacing some rivets, I was thinking about restoring the gun to its original finish. My only issue is that I do not know definitively what that finish was. I am fairly certain that it was not the green lacquer finish of the M/45b model. Does anyone have a clue?