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Since I'm no expert, is it all original?
Well, possibly yes. A movement number starting with 2401XXXX is an outlier for a 145.012-67, but according to Moonwatch Only it is possibly correct. That said, it would be a really early number, where I would expect a teardrop-end chrono hand rather than a square one. Possibly those hands are incorrect. Crown is a little dubious too, could be a correct 60's 32-teeth crown. Lastly, the bracelet appears correct, except for its end links which aren't pictured clearly.
More and better pictures would be required to make a decent assessment.
