I think the previous value estimate is about right, maybe a little high. Tough to establish a value from a picture, also, the concept of value is nebulous - basically, value is the highest price someone will pay, and you can't know that until you try to sell them. Lots of people listing guns on Auction Arms and Gun Broker have delusions about what they are worth, which is why there are so many multiple relistings. They are hoping for a sucker to come along. My feeling is that every gun listed should have a starting price that is realistic (or less), then let the bidders decide what it's worth to them.

Provenance is everything on common specimens like these. If there was hard documented evidence of a link to the S-V trial (such as a bill of sale to a person who was established to be a juror, dated at the time of the trial), that might increase their value some. Hearsay is worth nothing as provenance.