I'm trying to find the build date for my 1973 2.4S.

My letter from Porsche states it was built in Jan 1973, but then says it was registered 1st Jan 1973

My chassis number is 9113300807

Anyone know the build date for their cars with numbers either side of mine? Could it be possible my car was built very late in 1972?

I'm going to enquire again with Porsche to see if they might have more info.