Just picked up a clean Stevens 311 in 12 Ga. I think it is a 1947 or 48.  It has a lettered date code of D H and a circled D and a Tenite stock. Case coloring is good and it only been fired a couple of times. I have been trying to figure out what it is choked. I don't have a bore choke gauge. Each barrel is marked on the underneath with a M. Does that indicate that both barrels are Modified?
Am going to try an post a couple of pics but am still fighting entering image attachments. Not sure why I don't have permissions for attachments.