Ohio Rev. Code § 1333.01: Sale of trading stamps.

No person shall sell or issue a stamp, trading stamp, cash discount stamp, check, ticket, coupon, or other device which entitles the holder thereof, on presentation thereof either singly or in definite number, to receive from the vendor or other person, money, goods, wares, or merchandise, unless each of such stamp, trading stamps, cash discount stamps, checks, tickets, coupons, or other devices has legibly printed or written upon the face thereof the redeemable value thereof in lawful money of the United States.