I got a colt Diamondback in a trade deal today, I am not looking to keep this gun. I was wanting ti sell to get my money back from the trade, and the gun would be much better suited in the hands of someone who is a little more pationate about colts. My question is this. I was told it is a 1967 model. But I cannot find a serial # anywhere? Just the word Diamondback on the barrel with place of manufacture, and a colt emblem on the wood grip. The blueing is worn in places, and believe me, the gun looked like it is 40+ yrs old. How do I find out more about this so I can give an accurate description while trying to sell??? Thanks for the help!!!