In the absence of an answer from the OP, as an owner of one, I would venture that reasons why 145.012s are worth seeking out include the fact that it is the cheapest way to get into the classic 321 Speedmaster. You are also guaranteed to own a model which is truly Pre-Moon in that it will have been produced before the Apollo 11 landing, and along with the earlier 105.012 is actually the model used on that and other Space missions of the era. Collins Speedmaster was a 145.012 after all.
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