Some more information about the polymer notes- $5 bills have small position numbers on both sides, $10 bills normally have small position numbers on the train side, and large position numbers on the face side, $20 bills normally have small position numbers on both sides, $50 bills have small position numbers on the boat side, and large position numbers on the face side, and $100 bills have small position numbers on both sides. I would love to hear about any that do not match the ordinary types.