That is a cool Patrol Bike, but the description is not accurate. RE didn't start producing bikes as Indians until 1955, so it can't be an Indian model, though they did eventually make them like this. Also, that motor is a 500cc Big Head single. ALL the Chiefs came with 700cc twins. So that bike is a bit of a Frankenstein, tho it does look like they did a good job. Could be why they are only asking $4500.
Scottie