| The Cal 870/871 [message #8775] |
Sun, 11 February 2018 18:32  |
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JackW
Messages: 1872
Registered: May 2013
Location: Denver
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The caliber 871 and the 870 are the numbers for the open face/lupine (stem at 12-o'clock) or hunter/savonnette (stem at 3-o'clock) configurations.
Which one is which I'm not sure. They also came in a non-subseconds version too. There is also a variation in the setting works. Gruen and Rolex are not the only ones to use the movement either. Rumor has it that there is an outfit that will buy non-Rolex versions of this watch, mark the wheels with "Rolex" and then case and sell them as such.
Borel has the mainsprings listed with 1.60 x .14 x 340 11 and CousinsUK has them in 1.60 x .15 x 320 12. Both are white alloy.
Gruen (1947 Horological Manual) has them as 1.65 x .15 x 320.
All I know is based on hard work & writing by others. I can only aspire to augment this body of knowledge. If I am wrong it is because of my own failings. -me
"If I have seen farther it is by standing on the shoulders of giants." - Newton
[Updated on: Sun, 11 February 2018 19:38] Report message to a moderator |
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