I am a new member and am trying to determine the value of my Model 66, 4 # inch ATF commemoratives. They were sold in limited quantities to Special Agents to commemorate the 50th anniversary of ATF. I have two of them with consecutive serial numbers. I have the display cases and ATF belt buckles which were part of the package. They have never been fired or touched more than a few times in 29 years. I earlier said they were 2 1/2 inch.