One of Kieth's previous colts was for sale recently for a price which I considered reasonable.
People who've built and shot exact replicas of this no5 have said that the grip frame is too small for them and the guns are generally painful to shoot.
Grip frame castings are available for Colts and rugers.
Kieth was a little guy with short
fingers.
That is why the Ruger Bisley frame is an enlarged version of the no5 grip frame.