I can recall from perhaps around 1960 that some trading stamps, like "Blue Chip Stamps" or "S&H Green Stamps", which were issued by merchants, were marked "Cash Value 1 Mill".
You could collect 1200 Blue Chip Stamps, paste them into a booklet, and redeem them for items in a catalog. You could also exchange them for cash at the rate of $1.20 per book of 1200, or 1 Mill per stamp.
Oh yeh, I had forgotten all those stamp collections. S & H Green Stamps is what we collected right after I got married IIRC. LOL.
In fact I probably have a few unredeemed in some of the banker’s boxes stuffed in the basement storage area I stored documents in from way back then.