They are two of the three most important aspects of a vintage watch in my book, the other being the medallion condition.
That's the replaceability factor. It usually is a big part of the criteria I use for making a decision on selling one watch to fund another. If the one I want to buy is less common for whatever reason (very few left, hardly ever come up in as good condition, etc) than the one I'm considering selling then it's a smart choice to snag the rarer one and replace the sold one at a later time (if you even miss it).
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