I'm assuming that you mean rare Hollenbeck marked guns, but I'd like to say something on behalf of Francis (Frank). Juxtaposed to the rare Hollenbeck marked guns, there is a little Frank in so many American made doubles that he is, perhaps, the second most influential double designer known (in terms of production numbers). "Hats off" to Frank for accelerating the perfection of double shotgun industry in America. If there was a double shotgun "Hall of Fame", Frank would require his own wing.