Help with a vintage longines

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Hi good folks.
A friend of mine that works in a charity shop showed me this watch and I promised to help him out with an estimated value and information. It has been recently serviced by a professional and is in good condition. They got it from the watchmaker as a gift/trade. With original crown, box etc.
Serial reads 10418193 , 2328
Back case reads 6738
Thanks for your interest and knowledge.
Edited:
 
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This is a nice example of a caliber 23ZS from the late 1950s. "6738" should be the reference number. These are high-quality watches but the demand for them is not great. Given the attractive dial and overall condition, I think that anywhere from $300 to $400 USD would be a good result.
 
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It is a very nice looking watch if I saw it for 300 I’d grab it
 
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6XWx4M0.jpg [/IMG] LTjLQbv.jpg [/IMG] cuA2tAY.jpg [/IMG] Qe3KYP0.jpg [/IMG] P7aqGpo.jpg [/IMG] img
 
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This is the first time I joined the forum, so I had a little difficulty
6XWx4M0.jpg LTjLQbv.jpg

What the heck is that?

Seriously, start another thread like I told you. You shouldn't piggyback on someone else's thread.