I have an old Marlin pump shotgun. I think it is a model 28. Has a checkered pistol grip stock. From the front of the receiver to the tip of the barrel it measures 31 1/4". Ican find no markings for choke designation, guessing it is a full choke. The latest patent date on the barrel is Dec. 21, 1909. The gun is in good shape and not beat up. I My thoughts are, being a contemporary of the Winchester model 12, it should be safe to shoot. Or am I wrong? Any information would be helpful. Serial number is 60xx. I will try to post pucs as soon as I can.