Boy, you couldn't have picked one much more obscure. As you probably already know, there's bupkis on the intarw3bz about them, the Blue Book is silent, and there's only a small blurb in the
Standard Catalog of Firearms, which is pretty vague on values. ($200-$1000, depending on model and condition.)
All of my more detailed reference stuff is pretty specific to S&W revolvers or military rifles. Sorry!