Hi,
If the barrel has no other markings than the Suhl proof (and a later added caliber/made in germany marking for export purposes) and the muzzle-ring is roughly finished, rather than smooth it is almost certainly a post-war version from the same era.
If they simply took the barrel off another gun, I'd expect presence of the original markings (like serial number, proof and diameter) or signs of removal of them.
Last option is either some sort of 'spare barrel' from pre-war/war origins or a later replacement. Then it would be up to pre-war standards, with no markings except a 1945-50 Suhl proof (or no Suhl proof, if it's a later replacement).
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