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When I was a kid in the 1960s, I collected baseball cards, stamps, coins, bottle caps (with Twins players on the inside liner,) and a few other types of cards and other things. "Everybody" knew that only the coins and stamps were worthwhile long term. I would go to Woolworth's, where they had coin and stamps in large glass displays, hinged on the wall so you could page through them. I frequently would spend 35 to 40 cents for a plate block of 4 stamps from the 1950s mostly - so, 4 3 cent stamps plus the border showing the plate number.
My parents were pleased to see me tucking some of my money away into this long-term investment. Not that they had big expectations for future value, but it was seen as good, on principle, for me to be preserving my money rather than wasting it.
Fast forward 50 years. Last week I made another purchase of postage stamps, which I use for my mail order business. I get them from a guy who bought up very large stamp dealer inventories, and our standard deal, which we've done a half dozen times so far, is $2,000 face value in mint unused stamps, for $1,150 delivered. That's 57.5% of face value, and the seller always gives me a little extra, so more like 55%.
As usual, the stamps I get at that price are heavy in older, low denominations; the same ones I used to collect as a child. Now, I strip off the borders and plate numbers as waste, sort and audit them, and then use them on the packages I send, or offer them in smaller quantities (like 100 different for $10, or 300 diff. for $25) on ebay.
Bottom line, these stamps, as an investment, have done the following: In 50 years, a plate block of 4 stamps has gone from 35 cents down to about 7 cents. Invest $1,000, wait half a century, and have $200. Add inflation into the calculation (the fact each of those $1,000 original dollars was worth way more than the current $200 that remain) and it's less than $100 in real return.
My conclusion is that the baseball card blue chips will probably hold their value always, but with commons there is no guarantee.