Speedmaster 145.012-68.....does it exist?

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I only just saw this thread / checked mine as I had it out for the anniversary.....
1969 manufacture and a 68 SP case back.....

You have a beautiful example. This is very surprising to read that your ST145.012 was produced in July 1969. Are you sure that it was not sold in July 1969 ? I thought Omega has stopped the 321 Movement based 145.012 productions in 1968 ans started ST145.022 with 861s in end of 1968.