Game and Watch: Super Mario Bros, Special Edition - Widescreen

The winners of Famicons F-1 Grand Prix tournament got a yellow-cased version of Super Mario Bros. that came in a plastic box modeled after the Disk-kun character Nintendo used to advertise their Famicom Disk System. It was released in 1987. This is the rarest of all Game & Watch games, as only 10,000 units of this version were produced and it was never available for retail sale. Its part number is YM-901-S.

Rarity
The rarest of all Game and Watches! 





Estimated Value of Working Models (2014)

Boxed and Instructions: £500+ (seldom seen on Ebay, so hard to gauge a true value). 
Game Only: £300+