Wanted to get your thoughts on this watch. The dial seems off somehow but case and movement seems legit?
The dial forensics above are complete, so just the buyer's arithmetic, since you're weighing a purchase:
A redial doesn't take a percentage off a vintage Omega - it changes what the watch
is. To collectors, this is no longer a 2640 with a flaw; it's a
parts watch wearing a costume: genuine case, genuine movement, dial worth nothing. So the only price that makes sense is parts price - roughly what the movement, case, and crown would bring separately, which on a 2640 is a small fraction of a clean example. If the seller's asking anywhere near "honest vintage Omega" money, walk.
And the replacement-dial plan compounds the problem rather than fixing it: you'd pay real money and wait possibly years for a correct dial (as said above), and at the end hold a watch that's
still not original - just better disguised - with more cash in it than a genuinely original example would have cost you today. The math never closes.
If you love the jumbo idea, put the same total toward an untouched-dial example and never think about it again. Worn and original beats pretty and painted, every time and at every price.