£20000+ for a 16750(?) GMT on ebay with a 1665 case back!

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Dial & Bezel both look oddly ‘bleached out’…and patchy ?

For a 1970 watch…the Chamfers, Crown Guards, & the reverse of the watch case, are surprisingly crisp ?

Curious that…
 
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Interesting: caseback with serial number which mostly means special orders. s-l1600.jpg
 
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Definitely not a 16750. A 1675.

The exterior of the caseback looks ok. The inside is probably a pic from another caseback.