I have just taken delivery of my first wobbler (as I hear these are called ) and am concerned by a clicking noise it makes when I twist my wrist from 12 pointing slightly towards the floor to dial level with the floor, or in practical terms from typing position to read the watch. Strangely I cannot replicate the noise with the watch in my hand but it's infinitely repeatable on my wrist.

Is this anything to be concerned about?

Ooh. Video or sound clip would be so helpful but let's try... in the dark.

New watch or not new? Whilst you should feel the rotor wobble if you give your wrist a hearty flick, the 7750 isn't usually a noisy movement.

EDIT: I've just read that you're talking about a C1000 which isn't currently in production so not a new movement unless fitted with a replacement. Unusually this watch has a ceramic case: is there any possibility that there's a hairline crack anywhere in the case?

Any sound from a worn movement is more likely to be a metallic woo (I'm sorry, stick with me for a minute) sound than a single click.

A new 7750 movement shouldn't make any noise woo or click.

As you can generate the click on the wrist but not in the hand I wonder if the noise is in the bracelet, the clasp or buckle?

Have you got a screw-down crown not fully screwed down?

If it only happens during a certain wrist movement while the watch is on your wrist, is it possible that it has something to do with the strap/bracelet and/or it’s attachment to the watch?

I have a 7753 (modified as a Hamilton caliber H-31) and an Omega with a modified 7751 and have not experienced this. Not the exact same movement/watch, but in the same family. Still it doesn’t sound like something that should be happening, and I haven’t heard of it before being normal in a 7750.

I favour an issue with the strap. Perhaps a loose spring bar.

Easy to check out, before looking into something with the watch itself.

Guy

Sent from my XPERIA 5 III using Tapatalk

Wow, lots of things to try!

I can say it's not a spring bar - it arrived very dirty so the first thing I did was remove the strap (it's on a nato) to give it a clean with a cotton bud. The crown doesn't screw down either, it is pressed in. Didn't notice any cracks cracks in the case but wasn't looking for them...

I will record it later when the world is quiet and attempt to mute any strap related noises.

Thanks all

I’m going with a strap issue too - had it a couple of times, particularly my Pinion which is DLC coated - certain leathers will click/creak against the coating when I move my wrist to see the time. It’s worth trying some different straps and swapping the springbars.

I was wrong about the spring bars - both do move. However holding them through the strap so they can't the click persists.

I've managed to recreate the noise by holding the watch head between both sets of lugs lugs with the strap and springbars removed and gently shaking it along the 12-6 axis. Here's a recording made by holding it against my phone speaker while doing the above shake, you probably want to put the volume to about half as it came out very loud. You can hear the rotor and some other noise but there are 7 rhythmic clicks which are the worrying ones.

I just had a listen. Hard to tell without being there and holding it really, but that does not sound normal.

Something a watchmaker will have to investigate, I think. Any chance it’s still under CW warranty? I think those went out of production in 2016 so not likely. But a 7750 should be able to be worked on my any watchmaker if you wanted to go local rather than send it to CW.

Missing movement holder so the movement is just floating in the case?

This being a flyer type watch I wouldn't necessarily expect the crown to be screw-down but the archive, or another owner, will confirm. If you pull the crown out you should be able to see any threads on the outside of the stem tube.

tikkathree wrote: ↑Tue Jan 25, 2022 8:27 amMissing movement holder so the movement is just floating in the case?

Call me crazy if you like but I saw the caseback was screwed on and happened to have the correct torx driver so I took it off. The rotor is firmly attached to the movement (I read this can cause strange noises and is an easy fix) but carefully gripping the rotor I came to the same conclusion as you, although I didn't know there should be a holder - the whole movement moves very slightly in the case.

Time to ask the seller some clueless questions and see what they say, from the dirt in the seam and screwholes I'd say the caseback had not been removed for quite some time. Or it was convincingly "dirtied" for the sale, in which case I'll probably get answers which appear innocent regardless of the truth

ajax87 wrote: ↑Mon Jan 24, 2022 9:51 pmAny chance it’s still under CW warranty?

Nope, I have the booklet dated December 2016 so it's just out.

suicidal_orange wrote: ↑Tue Jan 25, 2022 6:42 pm

tikkathree wrote: ↑Tue Jan 25, 2022 8:27 amMissing movement holder so the movement is just floating in the case?

Call me crazy if you like but I saw the caseback was screwed on and happened to have the correct torx driver so I took it off.

Well, now you're an expert

The rotor is firmly attached to the movement (I read this can cause strange noises and is an easy fix) but carefully gripping the rotor I came to the same conclusion as you, although I didn't know there should be a holder - the whole movement moves very slightly in the case.

You don't say if it goes "click" A little slack between the movement/movement holder and case isn't an issue: here's a tip if when you use the chrono pushers you can see the dial moving in the case it is not right.

Time to ask the seller some clueless questions and see what they say, from the dirt in the seam and screwholes I'd say the caseback had not been removed for quite some time. Or it was convincingly "dirtied" for the sale, in which case I'll probably get answers which appear innocent regardless of the truth

ajax87 wrote: ↑Mon Jan 24, 2022 9:51 pmAny chance it’s still under CW warranty?

Nope, I have the booklet dated December 2016 so it's just out.

Dirt, 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.

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

Hope you get it sorted. I like the 7750, I find that there’s something very satisfying about the wobble on the wrist (or, I may just be weird!)

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?