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Cyma / Tavannes one-buton chrono


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I have just acquired this one - the price reflected the fact that the teeth visible in the accompanying close-up snap are worn and occasionally jump when setting. Otherwise it runs well. I was wondering whether there are any options for fixing this fault. So far I've been unable to identify the movement so sourcing a spare part (s) changes from difficult to impossible. I have some other reservations about it but I'll hold back on them for the moment.

Thanks!

Roy

 

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The movement is a A.Michel S.A Grenchen usually just prefixed as A.M movements the teeth look not to be meshing correctly as opposed to excessive wear so more a problem with the setting lever than the wheels it looks like to me

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Thanks. Could I have been more wrong? Quite possibly - I've had a lot of practice. Now I need to take a look at the setting lever - may be an easier fix than I thought. Are you absolutely certain about the movement? Not questioning you just interested in not having to be in any doubt.

And now that you've pointed it out, it's pretty obvious that the teeth aren't engaging fully - barely at all. How did I miss this? Same answer as above.

Roy

Edited by skridlov
lack of forethought
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You have to do your research when dealing with watches of this vintage on the bottom plate of your watch there are 2 markings one is a triangle made up of a A and M so that tells me that its a Adolf.Michel movement, there is also a second symbol shaped like a shield this is a Ebauches Trust mark also know as Ebauches S.A which was a small group of movement manufactures who in 1926 set up a partnership to pool resources in developing movements in order to survive against larger manufactures Adolf.Michel was one of the founding members of that group, the mark on your watch was fairly short lived and ran from 1936 to around 1939 so your watch movement dates from that period.

It looks like a calibre 237 from the dial side so you need to measure the width of the movement and confirm its a 12 ligne movement if so that would make it a calibre 1710 finding info on watch movements of this vintage is very hard finding parts is almost impossible, for a positive identification you will probably need a Bestfit book to check but you have been given enough information for you to do your research.

Other things I can tell you about your watch are that it is a British military issue watch issued by the Hydrographic Service  to the Fleet Air Arm so you maybe better doing more research along those lines, I think I have a reference book with this watch in, but I am at work at the moment so will look tomorrow when I get home,

Wayne

Edited by wls1971
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Thanks Wayne, a detailed and painstaking contribution.

I'm not entirely green when it comes to identifying movements - I have a Paulson catalogue and use the Ranfft site plus the usual web searches. I was misdirected a bit as my friend with whom I jointly buy and sell stuff was adamant about it being a Cyma. Strange how that sort of certainty can prevent one from starting from a blank page. There was another person keen to buy it who was equally certain and, it seems, equally in error!

Thanks again

Roy

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And here's another one marked Pontiac, but with the addition of shock protection the seller also states that this movement is a Venus/AM, Venus where also members of Ebauches S.A it could be that Venus assigned there own calibre number to the A.Michel supplied Ebauches.

http://www.lamesuredutemps.com/one.cfm?Supportchoc&uuid=E278E9E8-01FE-5E41-8264B9B7B15B414D

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    • in general this shouldn't be any change. but in general questions like this it be nice to know the specifics of the watch in other words how was it performing before it was cased up and what is it doing now.
    • just as a reminder this watch is a Swatch group product. This will bring up a problem like spare parts and technical information. that I found some links to some information on when I talk about your watch and some of the technical and basically your watch is equivalent to 2834-2 for which I'm attaching the technical sheets. But equivalent does not mean exactly the same you want to do a search on the group for C07 as we discussed this watch before including the technical differences how it's supposed to be regulated and basically because it's watch group there is no parts availability. https://calibercorner.com/eta-caliber-c07-xxx/   https://www.chrono24.com/magazine/eta-movements-from-the-2824-2-to-the-powermatic-80-p_80840/ https://www.watchuseek.com/threads/h-10-movement-details.4636991/ eta CT_2834-2_FDE_481857_15.pdf
    • people be honest.... Swatch is evil for the watchmakers and repairers, BUT not everything in watches from Switzerland is from the Swatch-Group. As far as i know, Selitta got sacked by Swatch as a Movement-Assembler for them and they started to produce Movements in their own Name with slight Modifications. As far as i know, they sell Parts to the Market for their Movements. In most cases, if a ETA-Movement fails, it is a valid Option to replace it with a Selitta Movement, which i consider the Solution for this Mess with the Swatch-Group...... I have no Connection to anybody at Selitta, but being a Swiss-Guy, i still like to have Swiss-Made Watches, but not from the Swatch-Group.   ok ? regards, Ernst
    • Just one more greedy act by Swatch. They started a number of years ago here in the US..cutting off supplies to watchmakers that could build complications that many Swatch houses couldn't even touch. Old school masters who had gone through some of the most prestigious houses in the world. Otto Frei has some statements on their page about it. I tell all my customers to avoid new Swiss watches like the plague,..unless they just want an older one in their collection that still has some parts out on the market, or they have really deep pockets and don't mind waiting months and paying through the nose to get it back. Plenty of others to choose from..IE Seiko,..or other non-swiss brands Even a number of Chinese brands are catching up with the Swiss,..and I think that in time, their actions will be their downfall
    • Yes. If that's not what you are experiencing...start looking for something rubbing. A 1st guess is that one of the hands is rubbing against the hole in the center of the dial. Especially if you now have lower amplitude in face up/ face down positions.
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