ive got one that was on my model 11 Remington auto that my gpa gave me.i think they were popular in the late fifties to late sixties but could be wrong.at one time i looked into selling it online and it seemed to be worth about 50 to 75$ at the most from the research i did. shotgun receiver had to be drilled and tapped for the one i have,which may be one reason they dont seem worth a whole lot. drilling 4 holes in the top of your shotgun isnt all that attractive.on the plus side, i actually kind of liked it for informal clay pigeon shooting and may reinstall it some time in the future. seems to me would make a excellent turkey sight.check ebay if they still allow such stuff or gunbroker and see what they are going for now.
