I always thought it was an 03-A3, but it might not be. I know photos would help, but not till tomorrow; not at home. prior to having it "sport-r-ized by a pro gunsmith in 1971, it looked like your typical 03-A3, however it doesn't have the markings above the serial# and it only has a 4 digit serial #. any clues?? I will try to answer all questions you have.