I have a shotgun with "Columbia" stamped on one side of the trigger housing. The housing appears to be silver plated. On the other side is machine stamped: Patented L.?.C. (cannot make out the middle letter, had to use a magnifying glass to read it) Aug 1.96 Aug 14.00 May2.02. The numbers 5 672 are stamped on the inside of the trigger guard, under the trigger guard, on the barrell under the wood housing and on the inside of the wood housing. These numbers appear to be hand stamped because the spacing between the numbers is not consistant nor are they perfectly aligned. Some are a fraction lower or higher than the others. can anyone tell me anything about this shotgun?