I have a Dan Armstrong mahogany bodied 4 string bass guitar with a single sliding pickup (not the interchangeable ones on the lucite models) and one volume and one tone pot. I can find very little info on the internet about these, but I believe they were made in the early 70's in England when Dan Armstrong moved over here. It has no serial number, as far as I can see. It's in good condition (not perfect, but a few small dings) and plays fine. Does anyone out there know any more about this guitar, or its value, etc? Any help greatly appreciated!