I had a slew of collections as a child. My biggest was Archie comic books, which I collected/read from ages 6-13. When I stopped collecting, I had over 700. I would count them and spread them all out periodically, to track the progression of the collection. Archie comic books were one of my biggest SIs in childhood. My other big collections during childhood were pencils, dead bugs, foreign coins, and feathers.
The only true collection I have now is I Love Lucy memorabilia. I have been collecting Lucy things for almost 12 years now. There is a large amount of Lucy merchandise available, but I am very picky about what I buy. So, although I own a ton of items in my collection, if I weren't as selective, I'd probably have two or three times the amount of items that I do. My favorite item in my collection is the "Job Switching" Mattel doll, which was the first piece in my collection.
As for coins, I do still have my coin collection somewhere. Like I said, in childhood, I was into foreign coins. As a teenager/adult, the only coins that have been added to my collection are American history-type coins. I collect the US President gold dollar series, the US state series, and I have special time period coins like buffalo nickels, 1943 steel pennies, and wheat pennies. However, I am not a coin collector or coin expert by any means.
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Helinger: Now, what do you see, John?
Nash: Recognition...
Helinger: Well, try seeing accomplishment!
Nash: Is there a difference?