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The postcards I believe you have are not issued by the Post office. They might be G Cachets. the cachet made by the Gateway Stamp company. The cachet can be Identified by a "G" with an arch over the top located at the bottom center area.

A Cachet is a design or inscription on an envelope to commemorate a postal or philatelic event. A collectible Baseball Cachet could include a players achievements, milestone, and record breaking accomplishments. A postal stamp and cancellation will coincide in date, or and relationship to commemorate the days event. Popular Cachets include Z Silk Cachets, and Gateway G silk Cachets. Cachets are also a popular item for players to sign.

The Earthquake G - Cachet dated Oct. 17, 1989 San Francisco Calif. Earthquake artwork, autographed by Manager Roger Craig is worth about $15. and unsigned about $7.50

The Game 3 G - Cachet dated Oct. 27, 1989 San Francisco Calif. Dave Stewrart cover, autographed by Stewart is worth $20., and unsigned $7.50

There were also 4 - San Francisco - Oakland series Cachets made by Z silk -Cachet that are worth about $20. Game 3 reads canceled by Eartquake below the silk artwork.

Part of the postal cancellation stamp reads Battle of the bay (Satiation) with the Official 1989 World Series logo

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17y ago

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