Sega's Master System celebrates its 25th anniversary this week but unlike Super Marios's or the NES 25th anniversary, Sega has no plans to do anything special.
The Master System originally released in October 20, 1985 in Japan which ended up being 2 years after the debut of the NES in Japan and 2 days after the NES test release in the US.
Rumor has it Sega was the 1st ever customer to buy the NES in the US and used it to help with their US debut almost 6-7 months after the official NES release.
http://kotaku.com/5670383/happy-25th...-master-system