Mission: Impossible (NES)

Build Dates
An ID string listing the build version and date can be found at the end of the PRG ROMs of the US, European and French versions of the game. A similar ID can be found in many other Konami games.

"MAST" or "MSTR" means it's the "master" version of the game, and the numbers represent the date. So, the US build was compiled on April 17, 1990, the European build on July 8, 1991, and the French version on July 18, 1991.