This long poster is most likely a store display or promo item of some sort. The front has SA1 Sonic in his Christmas themed stock art with Santa hat, coat & bag of gifts. The bottom says "Merry Christmas" and has the Sonic logo. The back has the same art again, but adds Tails & Knuckles in the background. There are also screen shots of various games Sega was promoting at the time. The bottom appears to have a date. This was found at Rare Mizuki store in Japan.