For what it’s worth, the start up of production shows a lot of oddities on these, and inconsistencies. The same goes for looking at 39 Gustloff guns, you see a lot that were over surface ground and subsequently restamped. I had one of the earliest production 12/34’s and it showed a lot of inconsistencies, numbers stamped sideways, errors, fire proof 90* to standard etc. These also have a high percentage of both factory and depot rework that has been seen over the years, for a number of errors. A couple of the main issues appears to be bolt clearance to the stock, as well as rear band fitment.
To me this gun looks to have been restamped and the extrusion from the die was left instead of being surface ground again as you would typically see in the normal sequence of production. Again on a lot of 39 Gustloff guns the date and codes are often out of alignment, so I wouldn’t be surprised to see that here. The rest of the gun looks good to go from additional pictures, just suffering from a bit of poor storage. It’s a bolt m/m with an A block 12/34 bolt in it.