Sharp GF-9191
In 1978, this GF9191 was the top of the line from Sharp. It is one of the cleanest, most iconic ghettoblaster designs. The chrome speaker rings, dual antennas, and dual VU meters look awesome. And all of the controls are on top, leaving the front face free of clutter. Overall, it presents a very symmetrical, clean appearance. Mick Jones of The Clash owned one, and it was used in the "Rock the Casbah" music video.
It measures 530mm wide, 323mm tall (with handle up), and 120mm thick. It weighs 6.4 kg (not including batteries). It has a voltage selector for different countries, or you can use ten D-cell batteries. It has 16cm woofers, 5cm tweeters, and two Hitachi TBA810SH amplifier chips. Its output power is 2x5.5 watts RMS (Sinus). For 1978, that was actually pretty good. It has more bass than most other 1978 models. It was offered in two colors: silver and dark gray. Shown below is the dark gray one, which was called the GF-9191HB.
You can find this model on Ebay UK or Ebay Germany quite often. But if you don't want to pay those high prices, you can get one for less money on Yahoo Japan. The model number in Japan was GF-303 and it is identical except for being Japanese voltage (100 volts).
If you need a battery door for this model, you can buy a 3D-printed one HERE