Street Fighter II - The World Warrior (911210 Japan, rev L) indicates another later revision (revision L) of the game, specifically released in Japan. Similar to previous revision numbers, this would include additional balancing, bug fixes, or other small adjustments to gameplay or visuals.  The focus on Japanese release points to possible adjustments localized for the Japanese market.

Street Fighter II - The World Warrior (911210 Japan, rev L)

Street Fighter II - The World Warrior (910522 USA, rev I)