This gun has only five (5) markings on it-Ser.# consisting of 5 numbers-36475. Hunter Arms mfg. co. on top left barrel. "Gladiator" on side. The letter A on the left barrel on the bottom. Pat'td 1911. I found out that it is not a sears gun as they were made from 1917 to 1919. This one is 1921. No ga. mark but it is 12 ga. by measure. No grade marks at all. Has anyone got any ideas what grade it is?