I think that the style of scope you have was called a Redfield "Wide-field".
I have several older Denver Redfield scopes and they all have serial numbers on either the elevation or windage base. All of them, even dating back to the early Redfield Bear Cubs, have some manufacturer's markings stamped on the ocular lens assembly, the magnification stamped onto the left side of the elevation base, and, in some case either "Redfield" (on the later scopes) or a serial number stamped below the magnification.
On an early Redfield Bear Cub 2.75x, the serial number is stamped below the "2 3/4 X" on the left side of the elevation base. The ocular lens assembly is stamped "Redfield Bear Cub Made In USA" and "Redfield Gunsight Co., Denver, Colo., Pat. Pend.".
On a newer, IOW not as old as the 2.75x, Redfield 2-7x, the serial number is stamped on the bottom of the windage base and "Redfield" is stamped below "2x-7x" on the left side of the elevation base. The ocular lens assembly is stamped "Made in USA" and "Redfield Gunsight Co., Denver, Colo., Patented".
Jeff
Last edited by 260Remguy; 03/13/14. Reason: grammar edit