This sub seconds Seamaster has patination on the dial and a well preserved 35,5mm stainless steel case. The case reference is 14389-4 and the movement is caliber 268. Serial number 17253743 (ca 1959).
The back cover has the small Seamaster emblem, and carries traces of pitting due to the typical “Nato-band corrosion”.
This watch was fully serviced summer 2019, and has been tested with the following results: Waterproofed 1 bar, rate +10,40 seconds/day, beat 1,66ms, amplitude 235,9 degrees (mean values after tested in 5 positions).