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Sorry, I'm a gearbox guy by trade. It is true that back then if you ordered a replacement engine it frequently wouldn't be fully stamped. When I worked at Carquip we had several 911 engine cases like that, though they were the other way around from your situation. They had type numbers on them, but no serial numbers.
The only way to find out (maybe) if it is numbers matching would be to pay for a COA from Porsche. Though that would only show how it was originally delivered and often things are missing. The COA on my 914 Bumble Bee shows my engine number but no gearbox serial number. And the older they get the more inconsistent they seem to be.
I don't know if you have closed the deal yet, but if it's a decent car, it is worth buying. A nice old 912 is a good car even if it may not be 100% original.
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1974 914 Bumble Bee
2009 Outback XT
2008 Cayman S shop test Mule
1996 WRX V-limited 450/1000
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