Normally the numbers one will find are stamped on the driveside rear DO and a matching number will be on the fork steerer. The speculation is that these are batch numbers, intended to keep the correct fork with the correct frame.

If this is indeed genuine - and there are features that seem to point to that - it appears to have been perhaps repaired at the front. That seems to include both head lugs and perhaps the fork (a repair could be why the brake hole seems to have been filled in).

Btw, that's not an early-80s track fork, in case you were wondering. Track forks had a completely different crown shape/engraving:



DD