Matt did gigs for Caffe Lena and for Vaughn and I here in the states (as for many others). He stayed with us on occasion and could have borrowed a banjo anytime, either for a gig or to plunk on around the house. I don't recall him ever doing so. He was a powerful unaccompanied singer, raconteur, satirist and humorist. That was his shtick. No instrument.

I'd avoid the e-bay item, unless some very reliable additional info surfaces.
                - George