calcone

I recently purchased an older franchi al 48, 20 gauge. It has a barrell with no choke tubes. The seller said it was a modified choke. How can I tell using the stamping on the receiver? I have a serial # as well and was wondering how I can use the stampings or serial number to give me more info about the age, etc. of the gun. Thanks. [ 01-19-2005, 09:20 PM: Message edited by: calcone ]