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Vintage IWC: What's up with this caseback?

Dan S
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Somebody modified the case-back for some reason that is hard to comprehend.
 
Modest_Proposal
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Dan S Dan S
Somebody modified the case-back for some reason that is hard to comprehend.

I know! I crave to understand the history of this watch.
 
Dan S
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Modest_Proposal Modest_Proposal
I know! I crave to understand the history of this watch.

You can own it, but you can never understand it. 😉

It's an extreme version of all the posts about frankenized Speedmasters with service parts where people speculate about how a given watch came to be in its current state.

But I totally get it. 😁
 
Modest_Proposal
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The inner case seems to have an ancient piece of tape/adhesive. Presumably to keep the holes "plugged". At least, I think that's what it is.
 
Dan S
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OK, should we make guesses?

It seems that maybe someone added through holes to screw something onto the back. There is a mark on the back suggesting this. Perhaps they wanted to mount the watch on something other than a watch strap.
 
Modest_Proposal
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Dan S Dan S
OK, should we make guesses?

It seems that maybe someone added through holes to screw something onto the back. There is a mark on the back suggesting this. Perhaps they wanted to mount the watch on something other than a watch strap.

Yes, I agree. It was clearly mounted to something.
 
Dan S
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I'm surprised that there is enough clearance inside the back for screw-heads.
 
Dan S
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Possibly the holes are tapped, but there seem to be circular marks surround the holes on the inside, as if there were screw-heads or washers. Not sure.
 
offrdmania
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Yup, looks like something was mounted to the case back. Probably in order to mount to something else. Whatever it was, it was there for a long time. It looks like some corrosion had started under whatever was there.
 
Dan S
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redpcar redpcar
Sold for 2.5K. That's all of it ☕

What makes you think it sold?
 
Dan S
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redpcar redpcar
upload_2021-2-1_21-59-36.png

Interesting price. Especially given the dial. The back can be repaired.
 
Shabbaz
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38mm case. Calibre 83. Introduced in 1935 up to 1947. 69,600 were made. 6,000 were used in the WWW Mark 10 military watches. (Source: OF)
 
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