Thanks for the additional information. I can't imagine how much the rollover pair of A99999999A/A00000000A must be worth. I saw a Series 1928C $5 Legal Tender G99999999A/H00000001A rollover pair listed for $45,000. The last four notes (the "Face Specimens" with blank backs) are from the Heritage Auction link that Steve posted.
Okay, but I'm very puzzled as to why the BEP would print specimen notes with such an obvious difference from the actual issue. Doesn't that rather defeat the purpose of specimens?
I recently received a $20 bill that says copy money in front and specimen in the back can anyone explain
Similar notes are legitimately used in China to train bank tellers, cashiers and casino employees. Unfortunately, they look good enough that a busy store clerk would easily miss them. Would be better if the "training money" looked more like Monopoly notes!
Notes with SPECIMEN on them are used for training people that handle money. They are also sent to banks to note and train people on a new bill.
PCGS has supposedly graded a few sets of uniface specimens bearing solid zero serial numbers on the front with blank backs. The fronts were paired with reverses that also had blank backs. Years ago, a set from San Francisco sold at Heritage for around $12-$13K with the buyer's premium. I've heard mixed opinions whether or not uniface are legal to own, though I imagine BEP policy is similar to other early small-sized specimens kicking around.