Good afternoon everyone and Happy Holidays-I'm a Selmer Mark VI guy, but I recently bought an Armstrong tenor and I'm trying to authenticate it-at least the year of make. I read somewhere(maybe on here) 5 digit serial numbers were made from 1949-1965. Mine has 4 a digit serial number. Selmer bought Armstrong but nothing on the web page but flute info. Is there an all knowing guru or wise man that's a go to guy with massive knowledge, or some where to get info? Thanks in advance!