Graham Greener in his book states that the "The Trap Gun" model in doll's head or square bolt persuasion was considered an "inexpensive model" at ten guineas. I don't think Mr. Greener means to disparage the model, only to give information. "The Trap Gun" models I have seen in high condition have been very nice, substantial guns in my opinion, regardless of their place in the hierarchy of early Greener manufacture. My doll's head and square bolt Lindners are quite nice also.