Can anyone advise me if it is correct for an Auto-Ordance WWII Thompson M1 SMG to have the serial number in the range 123xxx? Also, would a war-time Thompson made by AO have the name on the rear right-hand side of receiver 'AUTO-ORDANCE CORPORATION' with 'BRIDGEPORT, CONNECTICUT, U.S.A.' below it? I'm trying to confirm if this is a genuine AO WWII manufactured M1 or a put together one, and what year it may have been made. Are there other markings or features that might assist in confirming its authenticity? Thanks, Mike