Thank You for that succinct answer. If it is not too much trouble do you care to hazard a guess as to the date of mfg? I have finished cleaning it [Renaissance wax on metal and wood, cleaned the checkering, oiled bearing points and bore cleaned. It is a gem condition wise, for a working bird gun. It fits me perfectly and points like my finger. I paid under a thousand dollars and don't regret it for a second. I've ordered 4 boxes of RST 2.5in. Lite 7 's and 7.5 's. Heavy use I'm not quite sure. Its' lever is still to the right though slightly. No matter it will last longer than I will.
Thank You and Everybody else.

P.S. TUBE #? There IS A NUMBER UNDER THE CHAMBER AREA WHERE THE TUBES ARE JOINED #2027