I photographed these M1 81mm Mortar examples at Quantico, Newport News and Dubois WY
The M1 mortar was replaced by the M29 81mm Mortar in 1952, being lighter and with greater range.
Very similar to the Japanese Type 97 81mm Mortar
M1 81mm Mortar
NMMV Dubois WY 2025
M1 81mm Mortar
Virginia War Museum; Newport News VA 2026
M1 81mm Mortar
NMMV Dubois WY 2025
M1 81mm Mortar
This was labeled as an M2, but the M2 4.2-in Mortar was considerably larger.