Tupperware® ran a very successful advertising campaign "Put a Lock on Freshness" in the 1960's. These ads were a variation, "Lock in Freshness" and ran in women's magazines in the 1970 and later.

• Women's Day
• McCalls
• Good Housekeeping
• Parent's
• Ladies' Home Journal
• House and Garden
• House Beautiful
• TV Guide

I have been collecting these for years. I get them from Magazines I find at Flea Markets, Antique Shops, Garage Sales and eBay.

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