suicidal_orange wrote: ↑Tue Jan 25, 2022 9:36 pm

tikkathree wrote: ↑Tue Jan 25, 2022 8:54 pmDirt, aka wrist cheese, you and the watch can do without. My guess is that the dirt has built up over time rather than being applied for your benefit. If it's in the case back thread it needs to come out carefully and not go in. There should be a small rubber sealing ring in there to keep water out? I like to apply a tiny bit of silicone grease to the caseback threads but this isn't essential.

The case back is attached by seven T6 screws round the edge - no thread on the caseback itself, no o-ring and no sign of any silicone. It's only rated as 50m water resistant so I guess two flat bits of metal clamped together are more waterproof than the pushers and non-screw down crown. I unscrewed the screws then turned it dial up to ensure no "cheese" went in when the caseback fell off then cleaned it well while it was detached. Would be nice if the bezel came off as easily...


Got a surprisingly long reply from the seller already. One owner from new and he suggests the 7750 is just noisy and it's the rotor, ignoring the suggestion of a click. It's never been serviced because he doesn't until a watch doesn't keep good time so seems I'm the first person on English soil to see the custom CW rotor.

Searching for "Valjoux 7750 movement holder" finds me lots of holders to use for servicing the movement out of a case but none to fit in one and the video below shows two case clamp/screws but when he takes it out there is no holder - I was hoping to see a bit that I'm missing.


Instead I've found those screws and poking the one at 6 moves the movement maybe a quarter of a millimetre to the left or right so that's surely the cause of the click. The screw seems tight but I don't have a fine enough screwdriver to be sure.

I think everything adds up to a watch that had a long trip in a bouncy post van, I will take it to the local watch repair guy (assuming he comes back to me about my C65, which he didn't today) and see what he says.

Thanks again for your thoughts

Edit: I found a very thin o-ring on the floor that just happens to be the perfect size to fit round a ridge in the caseback, no idea how it came off without me seeing but I've put it in now

mik wrote: ↑Thu Feb 13, 2025 3:51 pm My C1000CE started rattling today when the balance was moving. I took the case back off, and as I suspected - the screw holding the balance had come loose, and tightening it effected a fix. Phew!

I do appear however to have lost one of the tiny case-back screws as there wasn't one in the 'ole when I went to remove it. Little allen-head screws (1.5mm allen key). Not sure how that happened as the watch has never had any work done to it since purchase, so its :

a/ Never been there. Seems unlikely - I am sure I would have noticed when I got the watch. (edit: I have looked back at purchase photos - all screws were in place)
b/ Fallen out over the years cos it wasn't fully tight from the factory - possible I guess?
c/ Fallen out over the years despite being tight from the factory - seems unlikely.

Regardless - the watch is generally fine with 6 of the 7 screws in place, but I would of course prefer to have the full complement. I have checked the threads by swapping screws over - no problems there.

So my question: any suggestions where to get a spare? I am guessing my best bet is to contact CW, but wanted to check whether I should try somewhere else?

suicidal_orange wrote: ↑Tue Jan 25, 2022 9:36 pm

tikkathree wrote: ↑Tue Jan 25, 2022 8:54 pmDirt, aka wrist cheese, you and the watch can do without. My guess is that the dirt has built up over time rather than being applied for your benefit. If it's in the case back thread it needs to come out carefully and not go in. There should be a small rubber sealing ring in there to keep water out? I like to apply a tiny bit of silicone grease to the caseback threads but this isn't essential.

The case back is attached by seven T6 screws round the edge - no thread on the caseback itself, no o-ring and no sign of any silicone. It's only rated as 50m water resistant so I guess two flat bits of metal clamped together are more waterproof than the pushers and non-screw down crown. I unscrewed the screws then turned it dial up to ensure no "cheese" went in when the caseback fell off then cleaned it well while it was detached. Would be nice if the bezel came off as easily...


Got a surprisingly long reply from the seller already. One owner from new and he suggests the 7750 is just noisy and it's the rotor, ignoring the suggestion of a click. It's never been serviced because he doesn't until a watch doesn't keep good time so seems I'm the first person on English soil to see the custom CW rotor.

Searching for "Valjoux 7750 movement holder" finds me lots of holders to use for servicing the movement out of a case but none to fit in one and the video below shows two case clamp/screws but when he takes it out there is no holder - I was hoping to see a bit that I'm missing.


Instead I've found those screws and poking the one at 6 moves the movement maybe a quarter of a millimetre to the left or right so that's surely the cause of the click. The screw seems tight but I don't have a fine enough screwdriver to be sure.

I think everything adds up to a watch that had a long trip in a bouncy post van, I will take it to the local watch repair guy (assuming he comes back to me about my C65, which he didn't today) and see what he says.

Thanks again for your thoughts

Edit: I found a very thin o-ring on the floor that just happens to be the perfect size to fit round a ridge in the caseback, no idea how it came off without me seeing but I've put it in now

mik wrote: ↑Thu Feb 13, 2025 7:20 pm As it’s my fault for tagging onto an aged thread - I’d like to apologise to @tikkathree and @rkovars for getting them to reply to the original 3yr old problem.

Thanks for the thought confirmation though - message sent to CW.