I find it provocative that the illuminated side of the crescent moon is opposite the sun rather than on the same side. One would think that someone observant enough to notice the Pleiades would be familiar with which side of the moon the sun was on?
Just an observation. The so called “primitive” people who made instruments like these relied on them to regulate such vital timing as planting, or gathering and laying up stores for winter. They may have also used them for timing celebrations or festivals worshiping the gods. Therefore they display remarkable accuracy. Anything less would be useless. Modern fakes tend to feed into the notion that the primitives couldn’t make basic astronomical observations, and seem to me to be deliberately “crude”.