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Tom Boblittbuy mint stamps / plate blocks on ebay at BELOW face value. Only marginally below but about 90-95% or so. Occasionally a little more.
There have been quite a few baseball stamps issued.......
1939 centennial
1969 baseball
Ruth, Robinson, Gehrig
10 different stadiums in one issue
20 different players including sisler, cobb and others
current ones
maybe more....don't know.
I have a TON of plateblocks and first day covers along with a minor collection of 1910's to present stamps. Collected these once as my grandmother was a postmaster in Maud, KY 40042......population of 40 or so when she was postmaster.