My neighbor has a CZ Duo 25 caliber auto that was made in Czechoslovakia. It also has the number 49 stamped on it. It also has the numbers 180504 stamped on it. Can anyone out there tell me anything about this gun. Also, do you have any idea what the value of the gun would be. I would classify it in good condition. Magazine holds six rounds and the gun shoots very well. Any help would be appreciated.