That's Zvezda 1:72 scale SU-100 WWII Soviet 100mm SPG.
Box in the traditional style of Zvezda, bright and colorful, patterned. The box includes 69 parts. The kit is cleanly molded in good quality plastic. The plastic model kit includes hull, small parts and tracks. Instrustion is laid out like most other Zvezda kits.
The SU-100 was a Soviet tank destroyer. It was used extensively during the last year of World War II and saw service for many years afterwards with the armies of Soviet allies around the world.