Hey ! The model 10 speakers were an existing product when I joined Sunn in 1978, I am guessing they were introduced in about 1974/5, and discontinued around 1980. They were made in the Sunn Speaker Plant in Williamstown, Kentucky. We built our own speakers and (of course) cabinets from the ground up in this plant. It was an awesome facility.
If any of the following is incorrect, please let me know...this is all from 30+ year-old memory. The Model 10 had four Williamstown-built 16 ohm 10" woofers (p/n 81-0116?) in series/parallel and one or two Motorola piezo's. I don't think it had a crossover, the speakers were just run wide open. It was kind of an upgrade to the popular Shure Vocal Master (Vocal Smasher) PA of the 60's. Power handling: If you can get a look at one of the 10's, I think it should have a square magnet assembly, appx 4 inches square. If so, it's a 20 oz magnet, with a 1 1/2" voice coil. These are good for about 50 W each, so the cabinet can handle about 200 W, but was probably rated at 100 W. We were very conservative in our ratings.
The Model 12 used two 16 ohm 12's (p/n 81-0226 or similar) in parallel and a thread-on 3/4" throat phenolic dome (I think 2" dia) RCF horn driver. (RCF stands for Radio Cine Fortuna, which is a decent loudspeaker manufacturer in Italy. If the RCF driver is not available, a CTS or Heppner driver can be used as a replacement.) Both the Low F and High F horn flares were made of bent 1/4" plywood, covered with white vinyl.
Hope this helps. Please let me know if any of this doesn't jive with what you have.....I brushing off some memory rust here.
Value? Have no idea...
Thx
Rex