What is this from? Can anyone guess the Caliber?

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So sorting my tray of plates and bridges into large one and small one. Then a second sort to pin lever bridges I found this in the tray of suspected pin lever bridges.

The pillar wheel is an indication that this is not a pin lever bridge. The color quality and finish though is similar. I also found in the wheel department, Wheels with heart cams.

I do collect sports timers (stopwatches) So I suspect the wheels are of that scale. This plate is large about 25mm or so. Looks to be a 3/4 plate so would probably fit into a 12 or 13 Ligne case.

Anyone recognize this?
 
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Looks like a bridge from Seiko chronograph 6139b
Edited:
 
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I have to agree with your assessment!

馃憤
 
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Makes perfect sense. Other loose Seiko parts and cases have shown up in this collection. Amazing how someone can have something for decades. Then with the help of the net find out what it is.
 
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Makes perfect sense. Other loose Seiko parts and cases have shown up in this collection. Amazing how someone can have something for decades. Then with the help of the net find out what it is.

Or more specifically ... with @Eve's help. 馃憤
 
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I read these posts with humility.
 
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I could not find many more parts so I listed this and some other items on ebay.

I think my name there is @delect-23 at least that is what shows in the name.

Now I am off to untangle some hairsprings, Becouse I hate selling and not comfortable mentioning such a sordid topic. Actually I am not selling these, I am giving them away if anyone bothers.

I put some cases up as well. This is the best one. I only post this as it shows my seller name for what it is worth.
 
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Thats nice of you, but the bridge is not 6138B, it is the 6139B
 
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Eve Eve
Thats nice of you, but the bridge is not 6138B, it is the 6139B
Oops. I just saw this reply. I found a 6138 data sheet. The parts look similar. Seiko is out of my collecting range. Not sure what the differences are. Looks like they do use a base caliber system. For now I will leave as is, since I am basically giving the part away. I am sure anyone interested can tell the difference.

Thanks for the correction.