Reproduction German Richtstäbe or aiming stakes for machine gun and mortar crews. Made in USA! Copied in great detail from an original example. Each stake has two pieces, one fits inside the other for storage and they can be attached together to form the complete stake. The fit tolerance is snug like the original so, after putting the stakes together and taking them apart again and again, the paint will eventually wear off; originals did the same thing. There may already be some scratches or other imperfections in the paint from storage. It is not unusual for originals to have very little or no paint left on the inside stake, especially if it was used often. These were rather expensive to make due to the unusual dimensions of the material. Still, originals are almost impossible to find and often sell for $250 and up.
To properly sight the gun, the crew would have a set of two aiming stakes.
There are at least 3 variations of aiming stakes in this size range so if your original looks a bit different, it is probably one of the other types. These are now as of Sept 2018 Painted!
The range stakes were introduced in about 1940-41 as a simple means to replace the RK31 aiming circle and free up that valuable resource. The ranging stakes allow one single heavy weapon to act as the aiming circle then the rest of the battery can sight off it.