Omega Speedmaster Professional Chronograph

wristwatch with stop function, model ST145022, c. 1985 -- watch case: stainless steel, tachymeter, diameter c. 42 mm movement: manual winding, lever movement, numbered 44122433, calibre 861, precision adjust, stop mechanism via switch, 17 jewels, soft iron anti-magnetic shielding dial: black, baton numerals, 30-minute index, 12-hour index, small second accessories: stainless steel folding clasp -- Case back with engraving: “Flight-qualified by NASA for all manned space missions. The first watch worn on the moon.”