I disagree completely with your conclusion, the main reason being that you fail completely to factor in the broader economic environment.
We are living in a unprecedented period of economic experimentation, and danger. I don't want to go too far off on a tangent, but the world is at the tail-end of the biggest credit/debt bubble in history, and by a spectacularly large margin. Unless you believe that a debt crisis can somehow be resolved creating mountains of new debt (spoiler: it can't), there is no way to avoid the awful consequences of the arguably criminal economic policy in which Central Banks around the world have been engaged.
Crippled further by significant demographic headwinds, there is no possibility that the massive debts accrued by the major Central Banks around the world can ever be repaid, except through hyperinflation.
Is anyone on this forum aware of the fact that the Swiss National Bank owns over $80b (that's billion) dollars worth of American stocks? More importantly, are you aware of how they pay for those purchases? They create "money" on a keyboard. Or, put another way, they create it out of thin air.
Now, one shouldn't have to be a business school graduate to understand how such purchases distort true – and crucial – price discovery beyond all recognition.
So, when I think about the current vintage watch market, I think well beyond how many Nina Rindts may be on the market, and imagine what kind of demand there is likely to be when the world faces yet another, major economic crisis. And while it is true that the best examples of sought-after models will likely retain more of their value than lesser examples/models over a long time-frame, in the near-term, none will likely be impervious to a severe shock to the economic system.
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