Erfurt with "M" marking

[DonVoigt]

"I assume that this was a Simson rework of an Erfurt. It could also be a depot rework using parts sourced from Simson. Are these a known variation / rework program?"

I would not assume it is a Simson re-work, sounds like an HZa mark on the right chamber, so likely a "depot" re-work.

Known, yes- they have been posted here or the other luger site recently; usually discussing the lack of a complete set of right chamber Imperial proof/acceptance markings.

The receiver sounds like a spare or one assembled after WWI for the first time.

Now questions:
- how is the barrel marked and numbered?
-serial number/suffix?

How about some pictures.