SS-G777ES
(1988 - 1991)

Sony's penultimate high-end loudspeaker - almost unkown worldwide and even in Japan...
Pity because this really was no toy, nor a gimmicky thing filled with far-flung technologies. Unfortunately, Sony didn't advertise about them at all and, as a result, the misconception did continue: Sony does not do worthwhile high-end audio.
Sony's non-advertising of serious audio goes way back to the early 1970s where one side of the top brass was for "be good at everything" (Morita) and the other side was for "never mind that - keep the cashflow coming with Trinitrons, portable appliances 'n all" (Namiki). Previsibly, the latter did win most of the time but it cost Sony a lot in terms of "image"... and sales.

I have no idea of the production run for the SS-G333ES or the much more expensive SS-G777ES but it could range between 250 pairs and 500 pairs. Where they all went is another matter...
But if you read the entire DIGIC technical review linked to below (the "more" button), you'll have a slight grasp at the utmost quality of the ultimate "G" loudspeaker - the SS-G777ES.
The second "more" button will show images from a recent Yahoo! Japan auction - just to give the feel of the quality. Sony's quality, pre-1992 financial crash, pre-1994 Morita retirement, pre-whatever: delicate and discreet magnificence.