I mean you’d need to have it authenticated. But with the names you have…i’d say $800 ish. Maybe more because they’re all together. Something looks off to me on Harold and Bill. but it could just be rushed signatures. Nice piece.
I don’t think an estimate from an internet message board is going to be enough proof for insurance purposes. If you want to assign any kind of serious value to it, you’ll need to pay to have it authenticated.
I am not an expert on valuations, but when you’re looking at getting it authenticated bring any thing that can help substantiate the signatures. For instance, if you had to buy a ticket to stand in line and collect the signatures, that ticket or receipt would help.