Vintage Omega Speedmaster Find: Collector Discussion

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Yesterday, at a family birthday party, my son’s father in law showed me this Speedmaster he’d inherited when his dad passed. He’s in no was a watch guy and tried to get it dated and appraised, with no luck.
I’m posting some pics here and asking for some identification from the many in-house experts.
Thanks in advance.
Jim

 
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If I read the serialno. correctly iovemyspeedmaster.com has this date:

 
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The serial puts it at at around 1970 as per ILMS above but the hands, dial and bezel look to have been replaced at some point and are much later. The bracelet too is later, 1990s. It’s almost as if a 3570.50 had a movement swap.
 
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Interesting responses so far… I’ll try to get a few more pictures but I don’t think I can get the case back, as the owner had it removed by a jeweler for the initial pictures but ir was reinstalled.
Any ideas as to value at this point, since it’s likely not in its original state?
 
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It's likely that during an official service at Omega, the components containing tritium, the dial and hands, were replaced, causing the object to lose all its beauty.
The bracelet, as already mentioned, is from the 90s.
 
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Strange watch. I was about to say it’s an early 2000’s Speedmaster before I saw the serial.
After seeing the movement I’d say it’s a 1970/71 Speedmaster that’s been back to Omega for a full restoration and unfortunately has had the dial, hands, bezel etc replaced with modern service parts.
 
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What can I advise him on an estimated market value, as he’s got no interest in watches and will be selling it…
Thank you all again.
 
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I have a 145.022-69 with serial 30584XXX which shows a production date just a month before yours... That time was a transitional period from DON to DNN, but the accent on your Tachymètre with the DNN indicates it's a mid-90s or later service bezel.

Considering the large amount of service parts this is probably not something collectors would want, but... it's still a fantastic watch! My 861 currently runs in the +2s/day range. Considering that the Grandfather-In-Law clearly serviced it, I'd guess this one could be a great watch.

If the sentimentality of it is worth any more than a couple thousand dollars it's probably worth holding onto and wearing without worry that you'll damage something and have to have it replaced with a service part 😆