James, the fishtail lever was not rare at all and wasn't an option - it was added by Parker Bros. as a production replacement for the straight lever on hammer guns to ease opening of a gun with the right hammer cocked. Many hammerless guns also have the fish-tail lever simply because the factory had an abundance of them available - apparently a lot more than ever would be needed for hammer guns.
A D top-action hammer gun would be prettier with the fish-tail lever IMO.
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