Brief description: Stainless steel barrel-shaped case men's manual winding chronograph wristwatch.
Round black metal dial with no numerals, but luminous (tritium?) hands, center red sweep seconds hand, surrounded by a luminous minutes/second track with luminous dots at 5-minute/second intervals; surrounding that is a black with white Arabic numerals tachymeter scale from 500 to 60 miles per hour; three subsidiary subdials:
3 o'clock: 30-minute counter
6 o'clock: 12-hour counter
9 o'clock: running seconds
Dial marked, OMEGA SPEEDMASTER PROFESSIONAL, MARK II, TACHYMETRE.
Crown at 3 o'clock sets and winds hands; pushers at 2 and 4 o'clock start/stop/return to zero both the 30-minute counter, the 12 hour counter, and center sweep seconds hand.
Producer name: Omega
Production date: Circa 1971
Made in: Europe, Switzerland
Dimensions: 42 X 46 millimeters (case)
Markings: OMEGA SPEEDMASTER
PROFESSIONAL, MARK II,
Dial: Movement: OMEGA, 31316519
Case (inside): 145 014
The Speedmaster chronograph was created in 1957. In 1969 it claimed its place in history as the first watch to be worn on the moon.
In 1969 Omega introduced the new-look Speedmaster Mark II with a streamlined case. The 1969 Speedmaster Mark II was equipped with the hand-wound caliber 861, which incorporated a cam system rather than a "column wheel." It has an uncompensated balance wheel with no screws, flat balance spring, and an increase in frequency from 18,000 to 21,600 beats per hour.
The Speedmaster Mark II came with the same Lemania-based movement as the Moonwatch.
This movement is Omega's caliber 861 and has been in production from 1968 until around 1996 when it was succeeded with the caliber 1861 movement. The Speedmaster Mark II had this barrel-shaped case that looked totally different from the asymmetrical Speedmaster Professional case. The regular Speedmaster issued to NASA astronauts was still in production though.
During all the Speedmaster Mark series, the regular Speedmaster Pro was always available (and still is).
When Omega stopped the production of the Speedmaster Mark II in 1972, the Mark III already had been introduced. The Speedmaster Mark III was succeeded by the Mark IV in 1973. The Mark 4.5, which is a Mark IV with a different movement (an Omega caliber 1045), came on the market in 1974. The last one of the Speedmaster Mark series is the Mark V, which was introduced around 1984. It is confusing, right? There are even more models in between and some slight variations on the above.
Omega - http://www.omegawatches.com/collection/speedmaster/presentation/speedmaster-mark-2
movement picture by "WatchFred - WUS forums"
|Place of Origin||Bienne, Switzerland|
Donated by Robert E. Putney