Swissman...as always, condition is everything. If truly excellent as you state. I'd guess $1,200-$1,500 for just the gun. Double that with the original case and double it again if its the package with the 3 barrel lengths and tools.
This was also offered as a cased set combination package with a .22 Perfected revolver. I've never seen that package so no idea on price there. I do know that in 1911, the package was offered for $27.00.