cazalea[Seiko Moderator]
17108
OK, the watch with no arrows
May 22, 2019,14:51 PM
Here's the watch with no arrows
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Hello all! I've a question for you experts out there.
By: halgedahl : May 21st, 2019-16:53
These images are posted here with permission of the owner, Alex83, who has the watch for sale on this site. My question involves the use of jeweled roller bearings on the rotor, which I've never encountered before and find quite interesting. Obviously oth...
No expert on these but if you take a look at Rolex movements
By: reintitan : May 21st, 2019-18:05
Until recently with the release of the 32xx caliber and the 41xx in-house chronograph movements which use ceramic ball bearings on the rotor, the 31xx, 15xx, 10xx caliber series dating back to the 1950s use a ruby jewel bushing on their rotors. Photo cred...
It is a beautiful application, but rather rigid.
By: mkvc : May 21st, 2019-19:56
My sample size is not large (I have owned two watches with that movement), but there does not seem to be any shock absorption built into the design. (Most automatic rotors do have some shock absorption.) Perhaps coincidentally, one of my two watches with ...
This is true. Jeweled rotor damage due to shock is a known issue
By: reintitan : May 22nd, 2019-15:49
Even with movements as robust as the Rolex 31xx and 15xx line. But it takes a lot to damage it; just think they're used on Sea-Dwellers, GMT-Master, Subs, and Explorers and were made in the millions of units over decades. It's an inherent weakness in usin...
Ceramic ball bearings didn't exist back then.
By: als1678 : May 21st, 2019-18:12
I have a vintage AP with the same, absolutely gorgeous, movement. When I bought it one of the ruby rollers was missing and AP replaced it during service. This was cutting edge at the time.
Here are those roller jewels
By: cazalea : May 21st, 2019-21:26
on a Vacheron movement as described earlier Good observation Fred, of a relatively rare feature that's implemented in different ways. In this case the rotor (indeed the whole movement) is large and "flexy" which is not a very good thing in a watch movemen...