In my basement, I have my great grandfather's OFEC collection. Except that he got more than one from every country that existed before 1910. Worth anything? Notta. He got them by sending to post offices around the world, so every last one of them is postmarked. I've checked their worth, but nevertheless, there are some really dandy stamps in it.
My GrandDad also did both stamps and coins (ah, the blood line). I can remember going into his house..To either side of the hallway were tall corked jars filled with Morgans and
Mercury dimes. So neat to a young kid like me. He collected stamps by the sheet, not individually, and put them into a safety deposit box.
And now they're all gone. He had to liquidate when Grandma had her spine fused. I've seen a few loose pieces, but the hoard, alas, is no more. :o(