What kind of grips are these?

[Ron Wood]

My immediate impression from the coarse checkering was Dutch also, but quickly had doubts. The coarse checkered Dutch grips were replacements made at the Geweermakers Scool in Indonesia and bear a small "GS" in an oval on the back, as Dick has mentioned, and do not have holes on the back. Grips with two holes on the back are typically Italian made repros, but they are very high quality and there would be no need to rechecker them unless they were badly worn or damaged. I suspect that Olle is correct that the holes are for work holding and the grips may be aftermarket (or original) items that were hand checkered by someone.