Read about the top 20 most valuable postcards here: https://mailseum.com/top20mostvalu...

Check out Mark talking about the holdtolight Santa postcard he sold here:    • Best Buy of the Whole Trip!  

In this video, I talk about the top 20 most valuable postcards that you can find in antique stores, estate sales, online auction sites like eBay, postcard shows, your grandma's attic, and more.

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