Good find, all praise to you.
They made a total of 2 devices with Symbian^1 (+1 refresh) before ultimately moving on to Android.
Symbian^1 was the attempt to harmonize the Symbian flavors into one open platform in order to compete, after Nokia, Sony Ericsson, Motorola and other contributed all IP into the Symbian Foundation.
Nokia called it "S60 5th Edition", for others it was "Symbian^1", and the first "common" Symbian OS.
So yes, I wasn't precise enough in the later comments, and you're correct.