Found 2 more "Dealer Sample" pre "S" serial number pre-fix Mk5s for sale in the US
Serial Numbers 1528 and 1532, Both imported by "Law Enforcement Ordnance" of Athens Georgia, both have bolts dated 1972.
Serial Number 1528 (note you can just see the barrel porting)
https://www.rockislandauction.com/de...les-sample-smg
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Serial Number 1532 (you can see how the outer casing tube was marked)
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https://www.milsurps.com/showthread....l=1#post387183 link to the update serial number list