UPDATE.I just took a small metal tape measurer and inserted it into the chamber to where I could feel it make contact with the step up in the barrel. I read it to the outside face of the chamber at the end of the barrel assembly. I did this several times on both sides and each time it read a hair over 2-3/4". At this point would you all say its a safe bet that it is chambered for 2-3/4" shell's? Still would like to know what year it was made. Thanks. Ed