Longines Grand Prize NOS?? Find from Local Junk Hoarder

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The crown puzzles me.
 
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I think the crown wasn't pushed all the way in after I set the time for the pictures - I'll need to reshoot it
 
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No, I think you should leave it up. It just seems different that other similar watches I have seen. That doesn't make it incorrect or a frankenwatch, just different.

The printing on both dials are also slightly different. That is common and I think they are both original dials. Once you get to the mid 1960's, Longines dial finishes began to become synthetic lacquer, which make for a more durable finish. So dials from this period are generally in better condition than other watches only a few years older.

I have some concerns about the "Stainless Steel" engraving being rather shallow. That would indicate some sort of polish and re-creation of the original finish. This is done all the time in restoration work, but if it were, I would not call such a watch New Old Stock ("NOS").

I think the point of this examination on my part and others, is that true NOS watches are extremely difficult to find "in the wild" as you say. The hang tag looks correct for this model, but have you had a watchmaker verify that the serial number and case reference match the tag? I just have questions as to whether it is truly a NOS watch, or just a nice specimen that has been expertly restored, but is not NOS.

Hope this helps,
gatorcpa

I removed it because of how it's perceived based on the assumption that I paid nothing for it. I know it is original without question. "Stainless steel" worn off is my only question too.
 
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Thank you all very much for the help - I appreciate any time given toward providing more information.
 
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I think the crown wasn't pushed all the way in after I set the time for the pictures - I'll need to reshoot it
It might be an optical illusion- but this is what I meant.
 
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It might be an optical illusion- but this is what I meant.

In person it seems to be straight but I do see what you mean, I will show my watchmaker and see if it needs to be adjusted. Thank you very much for taking the time, the infographic makes it clear
 
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I removed it because of how it's perceived based on the assumption that I paid nothing for it.
I never assumed you paid nothing, and I don’t think anyone else did either.

But I understand and appreciate your position.
gatorcpa
 
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The term NOS is something of a tricky one, since it's so difficult to determine whether or not a watch has been worn/used. Personally, I don't think this watch was ever worn, and I couldn't imagine someone taking the time to rework a case on a mid-range piece like this. A 13zn mono-pusher chronograph with a clean dial, I could see someone taking the time and expense to sharpen up the case, but not on a fairly standard model.

However, NOS pieces can still suffer from some wear ("shelf wear"), and it being unsold or unworn is no guarantee that it will be perfect. It depends entirely on how it was stored for the last 50+ years. I think the faint "stainless steel" mark is probably from worn-out tooling or a poor strike as someone else mentioned. Seeing that dial in the natural light is gorgeous!
Edited:
 
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At the risk of stating the obvious- Movement and inside shots are also useful to determine whether a watch is truly “NOS”.