(This was a joint release between us and our good friends at Gaming Alexandria!)
Mario Bros. Special on the Hitachi S1 – which is the seventh port of the game thus far preserved – the game is comparable to the Sharp X1 port which features the same graphics as the less powerful PC-8801 version of the game. While it has no known additional features from the other ports, there remains only one remaining version of this game to be found on the Sony SMC-777 (Although unconfirmed reports claim that a version for the IBM JX was released).
You can download high quality scans for the packaging here.
Cassette / Packaging Scans