What is this 16700? A Frankenwatch?

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I'm on the hunt for a 16700 GMT Pepsi and ran across this today on Reddit. What the is this? 4.4 million serial number and seller says it's a 1976 watch? I thought 4.4 million serial numbers were for replacement mid-cases and had nothing to do with a specific year.

What movement would this watch have? Seller says a 1976 movement. So a 1575?

What is this watch worth? Or can you even tell what it's worth given its mystery composition?





Here's the link:

https://www.reddit.com/r/Watchexchan...wiss/#lightbox

And the description:

Up for sale is a Rolex GMT Master 16700 - Blue/Red - Pepsi - Swiss Only Dial

Watch has a 4.4xxxxx Serial Number (1976)

Watch was just freshly serviced and is running perfectly without issue. Sale includes watch, service pouch, and service card (06/2022). Overall in fantastic condition with minor, if any, hairlines on bracelet and case. Original 1976 4.4xxxxx movement with factory service case (16700), dial, hands, bezel and bracelet.

$9450 plus shipping

And a photo: