Introduced: January 1986
Announced in September 1986
I'll be damned. 1986?! That late?
Well I've always been thinking the Apple II era had ended somewhere in 1983/84.
I remember that the first IIe model was introduced by Steve Jobs (and his friend, forgot who) to a wider audience in 1982.
The II GS must definitely have been a machine remarkably less popular as II and IIe, methinks. In all honesty, I haven't heard about its existence until today.