Omega. A Rare and Early Stainless Steel Chronograph Wristwatch
Model: Speedmaster Professional
Cal. 861 mechanical movement, 17 jewels, brown dial, luminous baton numerals, three engine turned subsidiary dials for 12 hour and 30 minute registers and constant seconds, stainless steel case, black bezel with tachometer scale calibrated to 500 units, two round chronograph buttons in the band, screw down crown, lyra lugs, screw back engraved with Speedmaster logo, case, dial, and movement signed
The present watch is a fine example of a first generation reference 145.022 Speedmaster with a tropical dial. These watches are highly sought after for their extremely short production run which lasted a little over a year. Examples such as the present watch with all-original details and a dial that has aged to an attractive chocolate brown are even more desirable by collectors. The transformation of the dial to a striking brown is further highlighted by the contrast against the black bezel and light cream color of the baton numerals and printing.
More information about the history of the 145.022 Speedmaster can be viewed here.