I did think they were knife rests possibly, but that was really only because I couldn't think of anything better. Dimensions are...........almost 2" (50mm) tall and about 3" long (75mm), with flat polished bases - a little wear, and even a couple of very small stones. No real idea of date either, but am guessing about mid C20 or bit earlier.
Does anyone have more accurate thoughts? - and thanks for looking.