Found a 357 nickel Border Patrol on consignment. Serial number is J505xx. Dealer has it marked as 1985 vintage. Looks to be about 90% since it has a blemish (old rust?) on the left side just behind the cylinder and another tarnish looking mark on the cylinder itself. Asking price is $649.00. I always get a little excited when I find a Colt on consignment but don't know much about this model. Is the price realistic? Is it a good shooter? How about appreciation? Is this a good investment Colt? Any other comments on what I should look for? Thanks in advance for the advice.