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I have replaced the crystal on my 1675. You have to remove the bezel first by getting a case knife in-between the case and bezel and lifting the bezel off. It should clip off fairly easily. There will be a very thin friction washer below the bezel, lift that off carefully. The bezel retaining ring then holds the crystal in place. To remove this you have to get a thin bladed knife in-between the case and the retaining ring and gradually working around the ring start to lift the ring. once the ring is removed you can simply remove the crystal. I had the movement in place when I put the new crystal in to centralise the cyclops over the date window. The bezel retaining ring is then pressed evenly over the crystal, friction ring place onto the retaining ring and then the bezel simply clicks back in place. Here is the assembly parts http://www.ebay.com/itm/RETAINING-RING-BEZEL-INSERT-ROLEX-OLDER-GMT-BLACK-1675-16750-/160812131467?pt=LH_DefaultDomain_0&hash=item257126648b

I think the setup for these is similar to the 1680, which you can see about 1/3rd of the way down this page: http://www.watchwallpapers.com/sw.htm There's the retaining ring which is press-fitted over the crystal, then a spring washer which sits on top of the retaining ring, and finally the bezel snaps over the edge of the retaining ring. The washer acts to create friction, so that the bezel doesn't rotate by itself, by making contact between the retaining ring and bezel (via the small lip where they overlap). The bezel can be pressed down (against the force of the washer) to allow it to rotate. That's how it works to the best of my knowledge, but hopefully someone that has experience with them can confirm.

I would guess they mean the mainspring is broken? To be fair, it is a generic term that non-pro's use to self diagnose their watches when they go wrong. "My watch is over-wound"! In other words - could be anything. If they could describe the exact symptom then you would have a better idea. For example - if the winder turns forever then the mainspring is likely broken. If it turns and flicks back then the click spring is gone. If it winds up fully but does't tick then..... and so on :)

Saying a watch is overwound is a fallacy. If the spring is fully wound and the watch is not running it is a fundamental problem with the movement. It is impossible to say exactly what is wrong with the watch without examining it in detail. It could be something simple like solid oil gumming up the works, but it is more likely to be a broken pivot, jewel or some other mechanical issue.

Excellent deal, Don! I'm happy for you. Cheers, Bob

Hi Dan good to hear from you. That certainly seems like a real bargain you've managed to get. I'll Have to google the whale, it's not one I've heard of. You must post some photos when you get them. I think you should go and celebrate with a couple of beers! :-)

That was also a book...I think by Frederick Lathe Forthis! :)

Excellent Clock boy. I was looking at that one myself along with a few others. About an hour ago I bought this one:- Reminds me of the film............."The Day of the Jacot"