Speedmaster reference question

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This is for sale locally. It’s a little high priced but complete. I have a question. I thought these sapphire case backs came with a sapphire crystal. This one isn’t. Does the watch match the reference?
 
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Looks like a sapphire to me over me over the dial.
 
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I thought the sapphire crystal was shaped differently? It felt like hesilite to me
 
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I see a milky ring, it's a pretty standard "brown dial."

If high priced I would pass I see lots of wear on the 2 o clock lug
 
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I think the caseback is incorrect personally.
Huh?

why wouldn’t that reference with a brown dial and a 1863 movement not have a display back?
 
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I have a chocolate dial Speedmaster and they are an interesting model, but not that popular. I recently swapped mine into a spare hesalite case just for something a bit different 😁
 
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Huh?

why wouldn’t that reference with a brown dial and a 1863 movement not have a display back?
I’m wrong. I was looking at a different reference that didn’t have the display back
 
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I took another look at this and thought about finding the correct bracelet. Why is the Omega 1998/849 so expensive?