How Do I Value/Price First Day Covers

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Ignore catalogs, ignore people who tell you what to collect, ignore people who tell how to collect.
Collect whatever you enjoy, collect in whatever way suits you. The only 'rule' is that you should be a good steward of the material you own.
Don

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/s/ ikeyPikey (who prefers addressed to unaddressed, because the addressed FDCs are covers that usually traveled thru the mail, where as the "C" in "unaddressed FDC" is best read as "Cargo")

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Harmer Sale 3029 The Eldon Mohler Collection of US Illustrated First Dday Covers Part 1

Lot 4642 https://hrharmer.com/en/_auctions/&...7&lotno=4642

803-34, 839-51, 1938-39 ½c-$5 Presidential Series, collection of over 1,000 in carton, mostly partial sets and singles, coils and electric eyes included, spotted a terrific set of ½c-50c Amon Carter combination covers in blocks with 4th Bureau corresponding issues, a good selection of hand-typed cachets, add-ons, hand drawn period covers, postcards and listed cachet makers; couple dozen $1-$5 values including a 832c plate block, mostly Very Fine (Estimate $2,000-3,000)