Like ny other gun, it's worth whatever someone is willing to pasy for it.
I have one of those "more or less rare" versions in .44 Magnum. I've never looked up thr book value, but I don't think I'd turn down $500 for it.
I didn't fight to defend your freedom so you could vote to take away mine.
"A man who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself.
John Stuart Mill."