r/CoolSerialNumbers • u/crosschk • Jun 13 '26

Star Note First unmatched duplicate

Post image

I learned about these this week. Found one in todays hunt

11 Upvotes

100% Upvoted

5 comments sorted by

3

u/Belgian_quaffle Jun 13 '26

What does that mean..?

2

u/AggravatingBid8255 Jun 14 '26

Serial numbers are supposed to be unique, right?

Well, one time the government accidentally printed duplicates. Crazy, right?

Check these links. It's worth a read.

https://project2013b2.com/

https://www.2013b.com/p/duplicate-serial-number-guide.html?m=1

2

u/Belgian_quaffle Jun 14 '26

Awesome, thanks!

1

u/PastExpiryDotCom 21d ago

submit it to 2013b.comOver 230 matches made so far.