My understanding is that for the Longines "Tre Tacche" watches (and as is the case for so many watches in the vintage world generally), it was not uncommon at one point for dials to be swapped and put into other cases – for example, because a watch with an amazing dial may not have had the best case, etc. The question is, I suppose, whether that devalues the watch or whether a piece like this can still be valued at his asking price of 12K euros given the very rare dial and great condition of the case.
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