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Early 70’s Speedmaster with 1980’s movement?

Rence
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IMG_2313.jpeg IMG_2314.jpeg
New member here.
I acquired a very clean Speedmaster from a family member a few years ago.
Running well at +6-7 sec/day, although I do not wear the watch much.
All chronograph functions are operational.
Upon opening the watch up to inspect it, Noted the reference is 145.022.71
The movement is numbered 4558xxxx
Research indicates this movement is from 1984 or so?
Is this a correct configuration or has movement been replaced with a service unit?
Any thoughts from the forum on this.
Thanks!
 
Spacefruit
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I would say its a later watch with an incorrect, (too early) case back.
 
Aludic
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4558**** usually indicates the 80s, around 1982. Especially those with a 45582*** serial. Certainly not 145.022-71, as @Spacefruit says, it’s likely something more recent. Probably a 145.022 CRS.
Edited:
 
Rence
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IMG_2321.jpeg
Thanks for the above replies.
I agree the movement and case do not match up.
One more thing though is the watch came to me with what appeared to be an original 1971 bracelet. Clasp marked 1171 and endlinks marked 633.
Not sure if the entire case and bracelet is an authentic 145.022.71 and the newer (but authentic Omega) movement from the 80s was swapped in or just the caseback changed ?
I have no idea when or why this watch appears with these unmatched numbers?
I can verify watch has been in my family since 1990 or so but have no idea if it was purchased new or used. Never serviced by anyone since 1990 but there are some indications of markings on the inside caseback, so it has been opened up at some time in the past.
How is the value of a piece like this affected by the discrepancy in the numbers?
Thanks for the replies!
 
padders
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They are not saying the movement and case don't match, they are saying the caseback and rest don't match. The 1771 bracelet used screw pins in the 1970s and had a different clasp, yours looks like the one seen from the 80s onwards that uses push pins. You can in fact still buy a push pin 1171 new right now.

You are overthinking it I reckon. It's a legit 80s watch with a caseback swap.

EDIT, I may have been hasty about the bracelet, the trapezoid logo on the clasp is that of an early one, but that one was seen until the early 1980s so might still be concurrent with the rest of the watch.
Edited:
 
Rence
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The bracelet pictured does indeed use screw pins. And does not the keystone shaped Omega emblem indicate a 1970s
1171 bracelet?
 
padders
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Rence Rence
The bracelet pictured does indeed use screw pins. And does not the keystone shaped Omega emblem indicate a 1970s
1171 bracelet?
See above, was seen up until 1982 according to MWO (the Speedy bible).
 
Rence
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padders padders
See above, was seen up until 1982 according to MWO (the Speedy bible).
OK then, that makes sense.
I may try to source a correct caseback from circa 1981-1982.
In the meantime I will just wear the watch from time to time as before.
Thanks
 
SOG53
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Its a nice clean and functional wearable watch as is- I personally wouldnt sweat the caseback issue- it is arguably a more attractive caseback anyway- its not a high end Speedmaster with or without the correct caseback and who will know the difference anyway
I say wear and enjoy!
 
Foo2rama
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As some of the experts on these watches have noted it’s most likely a caseback swap.

the dial is clearly post late 1977 and ran through the mid 80’s. So the dial and movement seem to match which tends to mean the caseback got swapped at some point. I’ve not looked at the bezel but I’d expect a DNN style bezel. Which is correct for either.
 
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