Top 20 Most Valuable Postcards in 2023

Read about the top 20 most valuable postcards here: https://mailseum.com/top-20-most-valu... Check out Mark talking about the hold-to-light 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. Visit my website at https://www.mailseum.com/ Visit my eBay store at https://www.ebay.com/str/mailseum