Is this a fake 1665 case back ?

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100% font is way off and inner caseback would have full serial or last 3

That's what I figured.
I think it could be considered a fake Great White case back.
 
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Vintage Rolex is really a minefield. I dont even dare to touch. Here are some GMT which I believe is way off
 
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That's what I figured.
I think it could be considered a fake Great White case back.

still wrong for great white and inner caseback has been altered possibly from another reference. Not certain but looks way off