trying to nail down what this may be worth. I think I have it close but not sure. as far as I can tell it was built in 1930 serial # C156840 Government model. slide is numbered to the frame and their is a proof mark on trigger guard. condition is 98 to 99 %. if my books are right I think it may blue book at 4500.00. not being a colt collector, I am asking for others who may know more than me.