I have one too, but no manual for it. However, I believe the crystals are the 10.7 regency type (6 high band, 6 low band), stationary channel monitoring, and an 'antenna tuner'- like potentiometer.
I'll dig it out and go thru it and see what I can glean from the radio; it's been a long time since I had it up and running. Used to be set up with SPEN (VHF hi), and EMRAD (VHF low) & a couple of others, for monitoring here in NJ and worked pretty well even with just a whip in the back. Worked great with a dual band roof mounted antenna
If I can find a manual I'll tag it & shoot it to you.
Despite just being a single frequency monitor, it worked great for listening to specific frequencies and you can find the crystals you need on eBay and various crystal manufacturers.