Is the 56 that you are showing over stamped?It could be the angle / lighting, but it looks (dare I say factory) overstamped to me. I know it's a few years off, but here is a 41/42 that happens to end in 56.
No, just trying to find examples of a 5 and 6 stamp from Mauser to compare against yours. What concerns me with yours is the top line of the last digit is not flat. The left side is extremely flat through what should be open for a 5. There's metal missing between the top line and the bottom loop. Leads me to believe it was either overstamped at the factory or altered later.Is the 56 that you are showing over stamped?
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I will admit I have virtually no experience with overstamps from factories, but this looks like someone stamped the 5 and the 6 and it looks pretty clean / period done.Closer picture
It’s a 6 overstamped with 5. Factory font it’s no issue