I'm no expert on Dan Wesson and have only owned one of their revolvers; a Monson made 22. I was curious, so I did a good amount of internet searching and was unable to find any combat style grips with those medallions.
I believe a previous owner heavily modified a set of their checkered targets, by adding finger grooves, rounding the butt and removing the checkering.
Note the uneven dark staining around each medallion. Also notice how the edges of the extractor relief cut were rounded.
Before modification:
After:
I'd like to be wrong for the OP's sake and hope anyone can show me a photo of a similar set of DW combats.