Hi. Thank you for your posts. In case this can help anyone else:
I just came back from a reputable buyer. We confirmed it’s sterling all over, but they can’t weigh the silver due to the presence of a stainless steel weight in the base/stem which they can not remove unless they melt it.
The shop apparently specializes in jewellery, so it would not expect to sell the leichter. As it is so beautiful and in excellent condition, they offered to buy it to disply in their store. This was partially to help me out, as they’re non-frum Jews who sensed I’m legit.
If I have time, they recommended an auctioneering house.
May no one else have to pawn, but if you do, hatzlacha.
