I would say you were spot on in yuor analysis. I would say all original a part from maybe cetral chrono hand (that might be also original but for sure later than the rest of the watch). Tachy insert looks indeed cleaner than the rest but I would say is original, not a service one, the service ones have a different font for the word TACHYMETRE, especially the C.
My overall concerns would be the hour and minute hands, clearly damaged and possibly nearly impossibe to find and the fact that the main part of the dial is pretty patinated to a relatively dark color...which I don't particularly fancy, but I guess it could be worse.
But I would put a hefty discount on this one given conditions.
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