Opposite the hot corner is the infield’s anchor position: first base. Aside from the catcher, the first-sacker is the only other defensive position to use a specialized piece of fielding leather known as the baseman’s mitt.

See WWII-to Postwar fielding leather:

DateMfr.ModelMilitary StampHandAddtl.
Stamps
1943GoldSmith“FM” Frank McCormickU.S. ArmyRight
1944SpaldingMarvel 64U.S.Right
1943Wilson533 XSTU.S.N.Right
1944Wilson555GNU.S.Left“3-45”
1945Wilson555GNU.S.Left“11-45”
1944Wilson563XSTU.S.N.Right
1945Wilson563XSTU.S.N.Right
1945WilsonU.S.Right“10-45”
1948O.K. Mfg.46U.S.Left“Aug-48”

Gloves and Mitts Home: