Can anyone date an Erma DSM34 for me? S/N 12964.

Barrel has the Crown B and Crown U with 5.4mm. No mention of 22 kal. Receiver is stamped ERMA -GmbH Abt-GEWWHRFABRIK-ERFURT on the left and Deutches Sportmodell on the right in a type of gothic script.

Don't know much about it. Found it in the barn about 25 years ago covered in rust and dirt. Someone tapped the receiver for a scope mount. Had it cleaned up and have wondered about it since. Stock has been cut down. No front handguards. Is there any chance of finding a stock for it?

Any info is appreciated.
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