An extra plug for Bob Hall as a weight repairer ...
Bob developed a method of grinding that generates very little heat and therefore is much safer for items that may have unreleased stresses. He is only able to work with with domed pieces, so faceted weights for example are outside his scope - which means for this interesting item, he probably could repolish it.
He will always give an honest view as to whether any damage is too much for him to achieve a good result. The problem is that it only needs one chip to be "too deep" to mean that excessive amounts of glass need to be taken off all over the weight, resulting in a loss of magnification or perhaps even a distortion of the interior elements.
Occasionally, a restorer will take more off the top than from the sides if this does not affect the overall look of the weight. But as I said, Bob will give a true opinion on what he feels can be done.