I've been thinking of doing this for years now, but this year I finally decided to pick up some fancy serial numbers and an error note at the annual coin show I go to each year. Nothing terribly exciting (just dipping my toes in the water), but it's nice to finally have something:
FYI, the error note cost me around $450 and the fancy serial numbers were around $100 each.
Any thoughts on what to call those fancy serial numbers? I'm thinking 80808080 would be considered a binary repeater, whereas 10101010 would be a true binary repeater.
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