Based on my personal experience as a Maxwin/CB700 owner and the catalogs here:
http://www.drumarchive.com/Maxwin/
My guess is a 1978 (or a year or two earlier based on the bass drum spurs) Maxwin-by-Pearl) Stage 805 set.
Based on what I saw in garages and on small stages in the early '80's, they must have sold boatloads of these. They hold some fondness for me because every broke punk rock kid back in the day had a CB700 set.
I started playing drums 3 years ago after rescuing the remains of a similar kit (but with the 13" and 14" mounted tom toms) from my neighbor's lawn.
I'm not surprised they sound good. Pearl seemed to have finally gotten pretty good at lauan plywood, and it's been aging for 35 years. Back in the punk rock days, these kits never had a problem getting LOUD enough!
One suggestion: while you have the heads off, treat the bearing edges with some paste wax or Feed 'n' Wax. It'll help keep the lauan from getting splint'ry.
I actually did the complete interiors of mine with Feed 'n' Wax but it looks like yours are sealed with paint.
Not sure where you are, but I'm in the San Francisco Bay Area and have a hoop for the bass drum. I would have no idea how to ship such a thing.