If I may add the following it may help or hamper this issue.

http://www.shotgunworld.com/bbs/viewtopi...+Flues#p3294681

https://www.proxibid.com/asp/LotDetail.asp?ahid=3693&aid=88051&lid=22180578&rts=/asp/searchadvanced_i.asp%23searchTerm%3Dithaca%26firstSearch%3Dtrue%26category%3Dall%2Bcategories%26searchid%3D%26type%3Dlot%26search%3Dithaca%26sort%3Drelevance%26length%3D25%26start%3D1%26refine%3D%26nc%3D1415795148802#topoflot

I saved pics of this gun, One of 10 prototype Flues Guns (the first ten) #175010. It has different barrel lugs, one is through the frame. If one of you would like to post the pics I will email my file of pictures saved from the proxibid auction.

John


Last edited by John E; 06/24/15 10:40 AM.