Stan, I owned the IJ Special Trap that was pictured in Conley's book on single trap guns. I foolishly sold it many years ago. Maybe you have my old gun. My double trap is a great gun too, vent rib, ugly factory forend, double triggers, original pad. I have a scarce 12 gauge Skeeter with Miller trigger and ejectors. The little 30" barrel Miller trigger .410 Skeeter is my favorite, of course. I've never seen another, but I hear they exist. I don't know about the choke markings. My .410 choke tools have disappeared. I always thought "choke and open" but I'm not sure about that.