Dave, my M88 is a 63 vintage and I have Redfield rings and one piece base from the mid-1990's on mine and a Leupold 3-9x40 from the 100 year tin box (think it is a VX-II derivative). The Redfield base looks vintage to the gun, but the Redfield rings from the 1960's used four screws instead of two screws like the mid-90's style. You might find some older Redfield rings in a gunshop somewhere on the shelves or on one of the auction websites. Good luck in your project, I think the M88 will look cool decked out in vintage optics.
Ps. At one time Redfield made a set of rings that had some light engraving on them and the screw came up from the bottom, it was blind on the top side. I know they are older than the 1990's but don't know if they go back into the 1960's. I think I still have a used pair somewhere out in the shed if you think they might work for you.