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The extract states its a 105.012 manufactured in July 1967
The extract is based on the serial number, there is no inspection.
There are additional watchmaker markings on the "top right" and "bottom right" lugs...
So it’s a 145.012-68 (ie not even a 67). There very little chance this is an original caseback imo.
Obviously this is conjecture but I’d say a realistic scenario here is a genuine 105.012 that went back for a factory service a couple of years later and for whatever reason the caseback needed to be replaced. In lieu of a service case-back as there perhaps wasn’t such a thing, this is what was used.
There are additional watchmaker markings on the "top right" and "bottom right" lugs.
My guess: the previous owner ordered an extract based on the serial, figured out that it's a 105.012, then scratched the "service" caseback to match the EoA.