In my family's collection that I've been sorting through, I came across about 20 of these coin holders that were used to mail cash refunds for some products, seems like a mail-in rebate type of thing - $0.25, $0.30. There are a number of them, from Nestle, Campbell Soup, French's mustard, Lipton, Hellman's, Mott's and a couple of coin mailing cards that look like they are meant for sending coins as a gift, complete with name & address lines on the front. Interesting, I thought.
Those holders are known as tab holders. They were commonly used when commemorative coins were issued. Coin dealers and collectors alike also often used them for their coins. And the holders created a unique toning pattern on the coins that were stored within them. And as you might expect that toning pattern is known as tab toning. When you see it on a coin, it is a pretty good indication of originality.
coin cards I found this fun site and thought you might like to look through it and see what products were like back when the coin cards were produced. http://www.silvercrowcreations.com/accessoriesframes.asp?main=Ephemera.htm jeankay
Thats rather neat :smile Love the links to both sites for differing reasons LOL and Doug you were not joking when you said the toning was rather distinctive LOL