- 1). Group your postcards together according to themes, eras or locations. You will make more money selling your cards in sets instead of individually. For example, if you have postcards of San Francisco in the early 1900s, group those cards together. Collectors look for sets of postcards when bidding or buying.
- 2). Use eBay's "Search Completed Listings" tool to start your postcard valuation process. The site boasts millions of completed auctions and may have past auctions that dealt with postcard collections like yours. The search tool gives you the option to search by product category, location, price and keyword. Browse previous closing bids on postcards similar to your collection and write the prices down.
- 3). Research local antique shops in your area and visit the establishments. Antique store owners may provide pricing advice for postcard sellers, including the prices of current or past inventory in the store. Potentially, after you have learned information about your postcards, the manager or clerk may make an offer on your collection. You do not need to accept the offer if you do not want to.
- 4). Check a postcard valuation guide for postcard prices. Look for postcards similar to or exactly matching your collection. Antique collectible markets vary according to supply and demand, so use the valuation as a guide for your own pricing. Valuation guides are available through antique shops and sites.
- 5). Photograph your postcard groupings and write descriptions for the items. The photographs do not need to be professional.
- 6). Assign values to your postcard groupings and select an online marketplace for their sale. Sites like eBay, Amazon, Half.com and classified listings offer markets for your postcard collectibles. Upload information and pictures about your postcard groupings, including the year of the postcards, any titles, conditions and prices.
- 7). Ship postcard collections in a non-bendable envelope after you receive payments from buyers. Do not attach a stamp to your postcards and mail them off. Ask for delivery confirmation from your courrier to insure against lost postcards.
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