Here is a fine example of an all original pre-moon OMEGA SPEEDMASTER 1966. ST 105-012 66 is the reference. The entire watch exhibits EXTREMELY clean condition, with Seamonster writing on case rear and original winding crown. The caliber 321, (considered to be one of the best chrono movements of all time) is keeping accurate time after a recent cleaning. The dial is interesting, in that is DOES NOT have the word “professional” written. 1966 was a transitional period. The reference 145.003 cases are said to have these “non-professional” dials, but like most watches, I have owned these 105-012 watches with this exact earl and rare version dial in the past.