In years bygone I collected both stamps and coins. It was a relatively cheap endeavor, and my hobbies actually made for some nice history lessons. I rarely "bought" anything (except at the post office), and I had relatively few trades along the way.
I recently saw that (except for real rarities) a stamp collection now has virtually zero market value. A local company said about the only thing with some value was to use mint stamps for postage. But they were even offering to buy any such stamps at < face value. Side issue: Where do you put all of those 3˘ stamps, on an envelope, to total 46˘??
As for coins, you don't need a Canadian dime to find some value. Virtually all silver ( generally pre-1965 ? ) coins now carry a huge premium...but it is essentially based upon the value of the metal and not the coin. (Even the WWII nickels, identified by the mint mark above Monticello, are easily worth >$1 each due to the high silver content in them.) A 1964 Kennedy half dollar can be worth close to $8 for its silver content alone. Although the 1965-1970 same had less silver in each coin, even they can command > $3 each.
Since my adult children have zero interest in my past activities as a philatelist and numismatist, there is not much I can do with my collections. Every now and then I will flip through my Scott National album...and grin a bit.
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