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This is an antique ROTARY chronograph from the 1970s, hand-wound type, and in very good condition.
The case is all stainless steel with a diameter of 36.0 mm(1.41 inches), thickness of 12.0 mm(0.47 inches), and lug width of 18 mm(0.70 inches).
There is no noticeable damage to the case, dial, or hands (however, the fluorescent paint on the hour and minute hands has not disappeared).
There is a stamp of FAB.SUISSE, SWISS MADE, 8613 1, ACIER INOX on the inside of the case back.
The dial is silver with gray surroundings and black printing.
From the top, it says ROTARY, 17JEWELS, SWISS MADE.
The small dial has an orange hand at 3 o'clock for a 30-minute counter, and a date display at 9 o'clock.
The long orange hand in the center is the so-called chrono hand.
The date display does not have a quick change function, but if you move the hour hand back to the 2 o'clock position after passing 24 o'clock and then return it to 24 o'clock, the date advances by one day.
The windshield is plastic.
The movement is the famous Valjoux 23 series.
It is stamped LONGINES WATCH CO, 335, SWISS, 17 JEWELS, UNADJUSTED, SWISS, 234.
This watch has basically the same design and movement as the LONGINES CONQUEST MUNICH OLYMPICS, which was released to commemorate the 1972 Munich Olympics. However, LONGINES does not have a date display.
Therefore, the LONGINES movement is LONGINES WATCH CO, 334, SWISS, 17 JEWELS, UNADJUSTED, SWISS, 236, which is a slightly different model.
Also, LONGINES is relatively common on the internet, but ROTARY is extremely rare.
Although the overhaul history is unknown, it is currently operating accurately, with an error of less than 20 seconds in 24 hours on paper. (However, please note that this may vary depending on the usage conditions.)
The belt is made of orange Morellato to match the orange hands.
The movement is the famous Valjoux 23 series.
Original dial in very good condition.

Please inspect pictures for condition reference.
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