The Bluebook of Gun Values warns about counterfeits, so I went and looked at the magazine tube and it is clearly crimped, swaged and necked down to fit 28-gauge shells. It is also a 2 7/8 inch gun, clearly marked. According to the Bluebook, the serial number falls within the range of 28-gauge numbers (746xxx). I'm seeing a variety of dates of production mentioned online, ranging from 1934 to 1937 as being the start of production. Who is right here?