Canti-venom

I spent a minute (2 hours) the other day looking around on the net to figure out what the hell these strange cantis that I have are, but I had no luck. I did however, really enjoy looking at all these far-out cantis that were made back in the day. I found two sites in particular that were really awesome, http://www.blackbirdsf.org/brake_obscura/mtb.html and http://tandem-fahren.de/Mitglieder/Christoph_Timm/DropBrakes.htm
Neither site has my brakes :Also, spied a sweet stumpy locked up the other day. I think the rear cantis make this an 1985 or '86. Sweet looking specialized riser stem...