Speedmaster 3572.50 with caliber 863...?

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In my search for a hesalite/sapphire sandwich Speedmaster, I keep on coming across these strange, transitional models... Just now I have found this watch which apparently is a 3572.50 reference with what looks like a gilted 863 caliber inside. The warranty card is from Japan and is dated 1997. Now, I'm well aware there was a short window of time when they used tritium markers in 3572.50, but I haven't yet heard about 3572.50 with the old 863 movement... That said, I'm a complete newbie so perhaps someone can correct me if I'm wrong! Or, could it be that the watch had the original movement replaced?

I'm posting a couple pictures of the watch in case it helps.

Many thanks!

 
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I believe (edit: from having read) the early ones could have an 863 as well...
IMO that’s a score, as it’s a bit of a prettier movement 👍
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The only downside there is that the chrono second had seems to have faded to a very dark shade and may not look all that attractive in the flesh. It could be swapped of course.
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Yes, I have one of these as well. All correct and quite unusual. Tritium dial. Mine is a 3572 too not a 3570
 
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Hi, what you have is the 3592.50/3572.50, called "Professional Yellow" on Moonwatch Only. The distinguishing characteristics are the "Professional" see through caseback of the 3572.50 as well as the yellow gilt movement from the 3592.50.
 
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Yes, it is correct as I have owned both 3592.50 with rhodium movement and 3572.50 with gilt movement. The gilt is “more rare” as produced shorter time frame.
 
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The bracelet is too modern. The watch came on a 1479 bracelet.
Here is mine
 
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The bracelet is too modern. The watch came on a 1479 bracelet.
Here is mine
Mine came on 1499/842. Sn 48355xxx