I've been playing with the 2L in my 73 car a lot lately, mostly trying to dial it all in after converting back to FI. I recently noted the serial number and compared it to published records. It seems the GA engine should have the GA followed by 7 digits. This one only has 6 and doesn't start with two zero's like I thought it should. Thoughts?
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My August ‘73 built 2.0 has GA006316, which is confirmed as matching numbers per the COA. It’s possible that your motor was swapped at some point with a later GA engine.

My bet is it's a factory (dealer) replacement case.
They came with no serial number, the wrench stamping it forgot a zero.

Herman had too many beers at lunch, we have seen this on the Karmann factory plates too.