[Ron Wood]

The trigger should be serial numbered to the gun. It is unusual that your trigger is only one number off! Your gun appears to be a 1920 commercial made up from a prior military piece, so it could indicate that the trigger was switched out early on from the consecutive gun by a unit armorer during cleaning/maintenance, but that is only a WAG. The side plate is properly marked, the 63 on the inside being the first two numbers of the weapon's serial number. I have no idea what the CN+ mark is, although a "+" usually indicates an armorer's replacement. The takedown lever is a replacement and is of the type produced for the 1929 Swiss model.