It looks really clean, almost new in those pics. How does it work?
As far as the year, I would guess mid to late 90's. I think Fender resurrected Sunn in the late 80's and ceased production in '01 or '02. Rich Briere would be the one to ask, but he hasn't posted here in a couple of years. I think he worked for Fender during the Sunn years.