Vintage JLC Atmos clocks -what to look for

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Agreed. But if the clock isn't winding, the mainspring is going to lose tension. Eventually, that 7-8 hours is going to be 7-8 seconds.

At least that's what happened to me. Originally, I thought the bellows were leaking or at least needed some more liquid/gas.

My clockmaker suggested that wasn't the problem. But during autumn, the temperature outside where I live doesn't vary much and my place is well insulated. So there is very little change in temperature in the house, so it's difficult for the clock to wind itself.

He said that the clock could run several months to a year without any winding at all. He also suggested that a couple of times a year I shut the clock down, box it up in its case, and put it outside on the patio for a day.

He manually wound the mainspring and the Atmos has run perfectly since. That was about 2 1/2 years ago.

So far, so good.
gatorcpa
 
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Unless there was a change in ambient conditions, temperature variations are sufficient to run the clock since it has been running for years. I think it may need cleaning and lube.
 
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I'm very interested in the following JLC Atmos clock. Looks good to me but I'm a novice when it comes to these. The nice thing is that it's local and would not need to be shipped. Do you guys or anyone on the forum have any insight into what I should be looking for. I appreciate the help. Thanks.

https://www.ebay.com/itm/352033888610
 
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These are so cool. Been wanting one for a long time, but heditant to pull the trigger.

Came across this one in a pawn shop this weekend. Seems double the going rate, but also not even sure if it is working.

Also, love @Mick Tock ATMOS. Based on that I see where the inspiration came for my 70s JLC.