You've got multiple "name associations" with Spiller's Parker, as the above points out: Bill Tapply as the subsequent owner, and the possible connection to Gorham Cross of "Partridge Shortenin'" fame, who was both Tap Tapply and Spiller's hunting partner.
I'm guessing that George Evans' Purdey, should it ever hit the market, would also command a premium--even though Evans had the chambers punched to 2 3/4" (without reproof) and messed with the stock. But the story of that gun is pretty famous, thanks to "The Upland Shooting Life", just as Spiller's Parker benefits from the story Bill Tapply wrote about it.
