Yes, you look at the first number, then the next and so on... hahaha

Actually, I have a database that contains every note I have and all the details about each one. I can get a handful of notes and enter data, such as serials and see if they match any other notes. Sometimes I get lucky. I am watching for an EXACT match- meaning one or both are counterfeit (never found one so far).

If you look at the 2 notes shown in the other post, it is funny that they are 65 years apart and George Washington does not look like he has aged a single day in that time!! Here's a brother and sister.... same serials, different denomination.