Thanks to you guys for the great info. It's kind of crazy. My first post on this thread was nine years ago and there were no replies. I have had the guitar in a case in my basement, and thought about selling it several times as I bought and sold guitars. But I lean toward unique, "collectable" guitars and always appreciated the quality of this guitar and couldn't bring myself to part with a guitar I paid less than $200 for and figured that was about all I would get for it. I currently have a couple of Epiphone Spotlights that I play mostly, another rare bird.
I will have to look under the pick guard and see what the pickups on the 38 say. They don't look as high-tech as the ones with exposed pole pieces (my first guitar in the late 70's was a Gibson Melody Maker with one pickup that looked just like these), but they sure sound great. The Kehler installation was done well, and the guitar stays in tune very well. In fact I bought a fixed Kehler roller bridge to put on one of my Epi's to replace the Steinberger KB tremolo, which has a major design flaw. I fixed the KB, but am still considering installing the Kehler, as I don't dare use the KB other than locked position.
I still have the push-pull tone pot on the 38.