Thanks for the help!!!Also as abit more info.
Reference 105.003 did not have the word Professional on the dial so you can rule that one out. Also didn't have crown guards.
Reference 105.012 & 145.012 had the word Professional and also the Omega Logo above the dial wording was an Applied LOGO.
Reference 145.022 had a Painted Omega LOGO above the dial wording.
So at a quick viewing, I would put that watch either a 105.012 or 145.012 (1964-1969)
* And your pic shows a bracelet that matches a 145.012 (1967-1969)
Another good article:
Speedy Buyers Guide