What has my grandpa given me!?!?!

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I was given one of my grandpa's old Omegas, and from the brief research I've done, I have found a few things, but I don't know exactly what I have here.

Upon initial inspection, the dial says it is a Speedmaster Mark III. However, the case and bracelet are a Speedmaster 125, and the 9 o'clock subdial has the same hands and colour as the Speedmaster 125. My grandpa was good at keeping all the original box and papers, but all I can make out is that the watch was purchased in 1973, the same year the Speedmaster 125 was released. My assumption of what I got here was that it was once a Speedmaster 125 that had to have its dial replaced and hands all updated, but the watchmaker didn't bother to update the 9 o'clock hands or subdial. Please let me know if there is anything I am missing or did not mention/realize in the write-up above, whether it is case, dial, movement-related, etc.

On a separate note, I really like this watch, but the Speedmaster 125 case is just too big, chunky, and unappealing to me, so I seldom wear this watch for that reason. However, I do like the cases on the Seamaster 176.001/176.007. Please correct me if I am wrong, but would switching all the guts I already have into one of those cases be a complicated process? I understand this would be a total Frankenstein job (Mark III dial, 125 movement, and a Seamaster case), but in that case, I would find myself wearing the watch more and would prefer the look. If this is possible, where abouts could I source one of those cases, and what might be a reasonable cost? All advice is greatly appreciated!

 
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It looks like a franken watch made up of a Speedmaster 125 case and a Seamaster dial. I'm not sure about the movement as I can't see the calibre number.
 
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You can see the Cal.-No. here. It is a 1040.
A cal. 1040 has been used in a Speedmaster Mark III (and in a Seamaster Chronograph too).

 
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It looks like a franken watch made up of a Speedmaster 125 case and a Seamaster dial. I'm not sure about the movement as I can't see the calibre number.
Thanks for help! I think the calibre number is 1040, but the 125 ran on a chronometer certified version of the 1040 labeled the 1041. Assuming this was originally a 125, why might you think this doesn’t have a 1041 in it?
 
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You can see the Cal.-No. here. It is a 1040.
A cal. 1040 has been used in a Speedmaster Mark III (and in a Seamaster Chronograph too).

Thanks for your help, I think you’re right! I found out the 125 ran on a chronometer certified version of the 1040 labeled the 1041. Assuming this was originally a 125, why might you think this doesn’t have a 1041 in it?

Also, if this is the same movement compatible with those other seamaster chronographs, do you think a case swap could be easy and doable?
 
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Thanks for your help, I think you’re right! I found out the 125 ran on a chronometer certified version of the 1040 labeled the 1041. Assuming this was originally a 125, why might you think this doesn’t have a 1041 in it?

Also, if this is the same movement compatible with those other seamaster chronographs, do you think a case swap could be easy and doable?
I am not assuming and I don‘t THINK that there is a 1040 in it, because I SEE that there is a 1040 in it. My post is refering to your own foto, you posted us. Take a second look.
And yes, the 1041 has been used for the certified version.
 
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I am not assuming and I don‘t THINK that there is a 1040 in it, because I SEE that there is a 1040 in it. My post is refering to your own foto, you posted us. Take a second look.
And yes, the 1041 has been used for the certified version.
I see the 1040 in the photo you circled. You may have misunderstood my reply, I was asking how do you think a 1040 might have ended up in this case if the original presumably might have been a 125 because of the 9 o’clock subdial and hands. Just trying to clarify the history of this watch and thought people here might have some insight on how it may have gotten to this point.
 
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It's always guesswork trying to figure out how a watch was frankenized. Sometimes watches were damaged by water intrusion, and brought back to working condition using whatever parts were at hand. It's just speculation on top of speculation.
 
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It's always guesswork trying to figure out how a watch was frankenized. Sometimes watches were damaged by water intrusion, and brought back to working condition using whatever parts were at hand. It's just speculation on top of speculation.
That makes sense. I appreciate your help!
 
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Looks like the insides from a 176.002 were put into a Speedmaster 125 case. You can buy a 176.002 case on ebay and have something more authentic
 
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Looks like the insides from a 176.002 were put into a Speedmaster 125 case. You can buy a 176.002 case on ebay and have something more authentic
It's funny, the author of the topic wanted to change the case to a less massive one. It turns out that such a replacement has already happened in the past.