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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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By HectorLooi · Posted
Probably any of the ETA quartz movements. I like the 955.112 as AliExpress has the PCB. But probably get a lot of quartz watches from eBay and see what you get. I've gotten a batch with a Bulova quartz and a 214 and a couple of Fossils. Totally worth it. -
I had to go back and verify what were talking about because I wasn't sure with the terminology what exactly you are discussing. Then yes depending upon where you are on the planet and when you are there is all sorts of differences. When I was in school the instructor George showed me how to make one. Such a simple device to make and so incredibly useful for 18 size full plate watches I wouldn't think of putting one together without it.
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