Street Fighter (US set 2) is a US release of the original Street Fighter arcade game. Set 2 likely indicates a later revision with potential updates to the original game, maybe including minor tweaks to balance or visuals.  Developed by Capcom, the core gameplay would feature the iconic eight characters and classic fighting mechanics that made Street Fighter famous. This version caters to the North American gaming market. 

Street Fighter (US set 2)

Street Fighter (Japan, pneumatic buttons)