
Omega
Speedmaster Professional Moonwatch 3590.50
42mmCurrent Production
The ref. 3590.50.00 is the predecessor of the better-known 3570.50.00. It is powered by caliber 861. This reference is also known as ST 345.0022 (bracelet) or ST 145.0022 (strap). 17-jeweled 861 until 1992, later models feature the 18-jewel version.






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