Given the overwhelming response to my previous post on curious $1 serial number bills sold, I figured I'd post another, sold yesterday.

"Bookends" are serial numbers where the last two or three digits are the same as the first.
Two-digit bookends aren't much to speak of unless there's something else going on.
Four-digit bookends are called "quad repeaters": the same four numbers repeat twice. Pretty sought after (I've got a couple for sale).
Three-digits ones can fetch a decent return of there's something unique.

This one is a set of four notes, uncirculated, all bookends, where the bookend numbers are sequential across the four notes (in this case 910, 911, 912, 913). Not something you find int he wild; gotta have few sequential stacks to pull them from (which is how I got them). This is one of those times where I get a bunch of BEP new stacks from the bank that at first glance are duds, no cool number sequence. On closer inspection I noticed the bookend on one, then realized that since I had four sequential stacks I'd have four bookends sequential too, and that's a nice find.

$9 for $4. Just over 2x, but now $5 earned.

https://www.ebay.com/itm/137003205869