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One thing to add

 

Even the watches that have recently sold for crazy prices would not have been good investments.  The Patek world timers, that have recently sold in excess of $1m, probably sold for at least $500 when they were new in the 1930s
so that is an increase of 2000x in 70 years, or 11 doublings.  That means that the value was doubling every 6 years, or about an interest rate of 12%.
Just an interesting bit of math
-a

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