Al, I collect automotive hubcap wrenches and came across some possibilities. The one on the left is embossed with CMC Co. and has the 2.5" octagon opening. The wrench on the right is a Timken axle wrench from the 1920's that came in quite a few variations. The variation shown is marked #55449 and came with 1924-29 Cadillacs. The large opening is 2.5 " octagon and the small opening is 1 11/16" hex. With a little machining, you could achieve the desired 1 3/4" opening and have both sizes covered with a single tool. These wrenches are common and there is a Lincoln variation as well. If you search on e-bay "Vintage Timken hub cap wrench" you will find the Timken issued variation. Be sure to verify that the opening size is correct before you order as each variation my differ.