I have a 12 ga. hammer gun serial # 150880 with an F underneath the serial #. I am not sure if the 1 is part of theserial number or not since it is not spaced the same and it actuall looks almost like an upside down T. The left barred says Hunter Arms Co. It also says some town in Ohio but I can not make out the letters yet without more work. Can anyone help me in dating this shotgun? Thanks.