Bushveld,
Technically,It wouldn't be proper not to change the marks if they no longer applied.You did point out that it is not in the EU any longer.A case could be made for having it reproved if it was in EU.Of course,the marks showed it came from the DDR (1956 was before the wall came down) and they weren't in the EU.
Nitro
Sorry for getting this started-The rifle is "A thing of beauty and a joy forever".
Mike