Prop personnel on the original STAR TREK usually used two different Peter Ganine-designed chess pieces for use in episodes featuring three dimensional chess. Before that style, for the second pilot, they used these unidentified pieces. Any chess aficionados recognize the design/designer?
The two Ganine sets most often used were said to have been purchased from stores by propmaster Irving Feingerg, as were the checkerboards which were cannabalized to build the 3D chess sets, so I imagine this first one was a store-bought set like the Ganines.
They most often looked tilted and about ready to fall apart! They were built using this on the market checker game: Space Checkers | Memory Alpha | Fandom