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:
| Date | Mfr. | Model | Military Stamp | Hand | Addtl. Stamps |
| 1943 | GoldSmith | “FM” Frank McCormick | U.S. Army | Right | |
| 1944 | Spalding | Marvel 64 | U.S. | Right | |
| 1943 | Wilson | 533 XST | U.S.N. | Right | |
| 1944 | Wilson | 555GN | U.S. | Left | “3-45” |
| 1945 | Wilson | 555GN | U.S. | Left | “11-45” |
| 1944 | Wilson | 563XST | U.S.N. | Right | |
| 1945 | Wilson | 563XST | U.S.N. | Right | |
| 1945 | Wilson | U.S. | Right | “10-45” | |
| 1948 | O.K. Mfg. | 46 | U.S. | Left | “Aug-48” |
Gloves and Mitts Home:
- Military Fielding Leather
- Interwar (1919-1941)
- World War II and Post-War (1942-1949)
- Korean War-1959
- 1960s – Vietnam War