If you were talking about frankening an 'original' from parts to sell to some unsuspecting n00b then I would pray to the Watch Gods smite you with a bolt of lightning - and I speak to them regularly, giving them sacrifices of chocolate, and doing their Earthly bidding by helping less experienced collectors with purchases, so I can make it happen!
What you want to do is have a wearable watch made from authentic OEM replacement parts with no fear of ruining it under normal use. Nuttin' wrong wit dat Jack! And yes, there are collectors who are purists who want nothing to do with WatchCo pieces and that's they're choice.... which is also perfectly fine.
The 562 is basically the uncertified version of the 561. Same kind of thing with the 563 and 565. Many interchangeable parts, just not all. A good watchmaker can usually adjust/regulate a 562 to run within chronometer specs since it's such a decent caliber to begin with. DeVilles or Genèves are usually the donors because they sell for less than the Seamasters and Constellations.
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