Sega's SG-1000 was released in 1983 and was thus the very first console that Sega ever released. It came with a wired controller, sported a mere 2k of VRAM and went on and eventually evolved into the Master System we all love and cherish. The console was released exclusively in Japan and is thus considered quite obscure in the West.
You can actually discover the joys of early Sega home gaming with the help of this Sega SG-1000 eBay auction. The console hasn't been tested, but does come in its box and with its manual. Seller ships worldwide.