I'm no expert on grips, but don't believe they are from any popular vintage maker.

They look newer, and the one medallion even appears bent, probably from removal and installation into new grips. Then the rest of the checkering and arrow pattern is rather poor quality and not symmetrical. At least in the pics.

It was probably somebody's home made project at one time. They look neat, but I wouldn't be shelling out Sanderson money for them.