I'm not "seriously knowledgeable" on these weights, but from browsing books and old sales catalogues, online auctions and from chatting to various other collectors, I offer the following comments:
19th century Saint Louis.
Concentric rows not of the neatest setting, but good.
(Super-)Magnum size is very rare.
I am a bit surprised that some of the later bidders had seemingly not noticed the period of bidding, for a day or so, when one bidder either withdrew or was withdrawn but had pushed the high bid up to the eventual winning amount.
I imagine that had this weight been sold 10 years ago through somewhere like Sotheby's New York, it could easily have reached a much higher price.