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I spent a few hours with this 3135 Rolex yesterday, and as we can all see, the reason the date and time can't be set is obvious. Had I known this—I was expecting a dislocated yoke—I would have refrained from running it, as we have no idea where those broken-off teeth are located inside the movement. It could very well explain the funny timing machine readings. Hopefully, the damage is limited to the first (there are two) setting wheel, but we shall see as the disassembly continues. It's a good sign that the sliding pinion teeth seem to be intact. It also raises the question of how something like this can happen. Perhaps too little or the wrong type of grease in the cannon pinion, and when it became difficult to set the time, the crown was turned with force and too quickly. That reminds me of another movement (years ago) where the cannon pinion was way too tight, and I still tried to set time, which broke off the teeth on the minute wheel. However, it was a scrap Vostok, so no real harm done. -
By Neverenoughwatches · Posted
Can anyone help with the identity of this movement please. Books i have searched up to now include 1 and 2 of Bestfit 1965, Bestfit 101 1956, Flume 1958 and 1972 and catalogue officiel 1955. 24mm plate which lands around 10.5 - 10.75 lignes -
Welcome to the forum. Here's a good site that in your case shows the original along with the modern alternative. https://www.emmywatch.com/db/movement/gruen--490ss/ -
By RichardHarris123 · Posted
Hello and welcome from Leeds, England. Yes, you can use a modern mainspring. Breaking grease, protects the barrel from excessive wear. -
It depends what type and era of watches you think you'll be looking at. The ETA mentioned by @HectorLooi is a good option but you could look at some Seiko/Hattori as a lot of off brand watches use these. Edit I suppose the other question would be are you going to do this for pleasure or profit?
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