Vintage Ultra-Chron blog post

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Is the ultra chrome logo crooked, or is a distortion from the glass;
Apparently a distortion, as my phone doesn’t take the best photos, sorry. Also, thanks for the catalog photo and, yes, it looks much like #4 with the exception of the Longines “Wing”, which is not present on mine. May have something to do with the Roman numeral configuration? I haven’t seen another like it.
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Yup, 7851 - I was just looking at the same Japanese catalogue! Here's another one with that dial:

https://vintagewatchrestoration.com...-mint-square-tonneau-case-automatic-33-5x38mm

Are you sure the logo at the bottom isn't bent..? It sort of looks as if some clumsy watchmaker has knocked it from the base and bent it upwards, while it's still anchored by the two pins at either side. It might be possible to bend it back into better shape with tweezers and a microscope, but you'd need to be very, very careful not to break it or scratch the dial...
 
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You may be correct, but that is certainly not in my wheelhouse. I really don’t know much about these, but it appears they are quite complex little buggers. I’m not really sure if I would even entrust this to my watchmaker to take on, so I may possibly move this along and let someone else enjoy it. It is a lovely timepiece though and appears to be original, even if the Ultra Chron symbol is a little wonky. I think it adds character, no? 🤔
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You may be correct, but that is certainly not in my wheelhouse. I really don’t know much about these, but it appears they are quite complex little buggers. I’m not really sure if I would even entrust this to my watchmaker to take on, so I may possibly move this along and let someone else enjoy it. It is a lovely timepiece though and appears to be original, even if the Ultra Chron symbol is a little wonky. I think it adds character, no? 🤔
The movements aren't really any more complex than most simple three handers (although they do have an instant date change mechanism, like Rolex). They run at a very high beat rate which meant that you had to use special oils back in the day, but these days such oils are fairly standard I understand. However, it's possible that the movement is quite worn as the watch has obviously seen some use and these high beat movements are reputed to wear faster.

IME (from having my high beats serviced) the biggest problem is usually the difficulty of replacing the mainspring, as you can't get the original "do not open" barrels any more, and while you can prise them open and replace the spring, it's often dofficult to find one that works perfectly because the high beat rate means they are quite strong and finely tuned..
 
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@Neeb thank you for the thoughtful response, it’s most appreciated. Yes, the old girl has seen some use, but it runs remarkably well and is still extremely accurate. The only issue at the moment is that it doesn’t wind, only the automatic mechanism keeps her going. The hand wind feature seems to be stuck, as it won’t turn clockwise. I’m no expert, but I’ve determined through a process of brilliant deduction that this cannot be good! 😆
 
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The hand wind feature seems to be stuck, as it won’t turn clockwise. I’m no expert, but I’ve determined through a process of brilliant deduction that this cannot be good! 😆
Nothing that a proper service can't fix. It could be that the manual winding mechanism needs lubrication. I find that common with 1970's watches, but not with earlier models.

Not sure why.
gatorcpa
 
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Thanks for weighing in gatorcpa, Anyone Stateside that you guys would recommend for a service, preferably in the northeast?
 
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Sorry, newbe here. I was just wondering if there are any Ultra chrons with a Tiffany dieal? Or is that a redial?

 
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Sorry, newbe here. I was just wondering if there are any Ultra chrons with a Tiffany dieal? Or is that a redial?

To me that looks like a white/silver dial that has been photographed with a blue-shifted colour balance (as happens, e.g., if your camera or phone thinks the light is warm-white / artificial but it's actually daylight).

Do you have the watch, or is it just a photo you came across?
 
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These are nice watches, Longines' last hurrah. Here's one of mine. Looking for a new home, actually.

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I've read the three parts and I am really impressed!
Wonderful job; I saved the link on my pc.
Thank you very much.
 
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As far as you know, those references came with both strap and bracelet?
And in case it was a bracelet, was it that shown in the first photo of part 1 of your essay?
In case it was a strap, I suppose it was that in this photo.
 
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These are nice watches, Longines' last hurrah. Here's one of mine. Looking for a new home, actually.

Very nice.
What reference is it?
 
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Very nice.
What reference is it?
8309, I believe, but I'm not 100% certain.
 
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As far as you know, those references came with both strap and bracelet?
And in case it was a bracelet, was it that shown in the first photo of part 1 of your essay?
In case it was a strap, I suppose it was that in this photo.
Yes, the references my blog posts deal with definitely came with either straps or bracelets. There are Japanese catalogues showing both options.

The buckle you showed looks correct.

As far as what bracelets are strictly correct are concerned, that's a bit more difficult... The bracelet on my 7951 (first photo in Part 1) is one I found separately, although it's definitely of the right era and I've seen it fitted to other examples of the same watch. It more often seems to be seen on Conquests of the same era, however. I posted here about three different types of bracelet I've seen on these watches:


The first one pictured is the only one I'm certain came fitted to these particular references from the factory (because of the catalogue pictures). But the other two types seem to fit perfectly too, and I've seen more than one example of each on these references. I'm pretty sure that Longines must have designed them to be interchangable at least, the end-links fit so well. Perhaps the bracelets were even sold separately by Longines dealers as alternative options when buying a watch.
 
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To me that looks like a white/silver dial that has been photographed with a blue-shifted colour balance (as happens, e.g., if your camera or phone thinks the light is warm-white / artificial but it's actually daylight).

Do you have the watch, or is it just a photo you came across?
It is a charity auction. The blue hue may be as you said a reflection, but I might still go for it, since it has the typical art deco numerals, as long as the bidding does not take me over 300 E. Thanks.
 
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Yes, the references my blog posts deal with definitely came with either straps or bracelets. There are Japanese catalogues showing both options.

The buckle you showed looks correct.

As far as what bracelets are strictly correct are concerned, that's a bit more difficult... The bracelet on my 7951 (first photo in Part 1) is one I found separately, although it's definitely of the right era and I've seen it fitted to other examples of the same watch. It more often seems to be seen on Conquests of the same era, however. I posted here about three different types of bracelet I've seen on these watches:


The first one pictured is the only one I'm certain came fitted to these particular references from the factory (because of the catalogue pictures). But the other two types seem to fit perfectly too, and I've seen more than one example of each on these references. I'm pretty sure that Longines must have designed them to be interchangable at least, the end-links fit so well. Perhaps the bracelets were even sold separately by Longines dealers as alternative options when buying a watch.
I don't want to go OT in this thread. I posted a comment in the thread about bracelets you linked.
 
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It is a charity auction. The blue hue may be as you said a reflection, but I might still go for it, since it has the typical art deco numerals, as long as the bidding does not take me over 300 E. Thanks.
It's not a reference I know, but it's interesting and quirky. I'd guess it's very late 1960s. The crown looks a little odd, it may have been swapped, but that's not such a big deal.