Yes, contacted (old) Kenwood Corp HQ in Japan - it seems since 2007 , the company spun off some groups.
There's JVC-Kenwood now- a merger of both Japan Victor Corp & Kenwood, of the in-car and home entertainment fame plus the walkie-talkie, radio transceiver group still in Japan.
The instrument division appears to be owned / run by a US group called Texio in Maryland.
Making contact with them to see if they can help - a quick check of their website no longer shows any Signal Generators like the DG.
The 'pup' I bought was made in Japan, hard to tell if 1990's or this millenium. Actually what I needed was a function generator for some hobby work as a newbie -create some sine/square/triangle waves.
This appears like a more complex device more suitable for telecom/radio/tv engineer, that's why I'd also appreciate some advice from experts who may have used something like this.