Anyone With Info & Specs - Calbest Stereoplex

I picked up this unit - 18 tube Am-Fm-MX "Stereoplex" Model 6400 receiver made by Calbest Electronics - LA, Calif. at an Estate Sale and was looking for any specs, info and value.

It has a date of 1/29/64 stamped on the chassis. It has a very unique woodgrain face and seperate tuning knobs and indicators for AM & FM.

It appears all original except that some tubes may have been replaced.

Any help would be appreciated...thanks