Looks very much like a Golcher based on roll engraving and overall appearance. This appears to be a replacement lock that reasonably fit the old mortise. Note the gap on the nose of the lock, where the original lock was about 1/8th inch longer. The somewhat "sloppy" cutout in the lock plate for the percussion drum, or side lug, suggest a replacement lock as well, since the original would have been a much snugger, cleaner fit.
When a lock is replaced and the new lock is slightly larger, the mortise is opened up slightly to accommodate it and lock is a good fit in that area, which may have happened on the back end of the lock. But when the replacement lock is slightly smaller in some area, such as the nose area on this lock, that part of the old mortise is left open/visible as in this case.
Shelby Gallien