Re: Stupid Question about Selmer Saxophone serial numbers
First, Welcome to the Forum.
Selmer Paris is totally different from Selmer USA.
If you are looking at vintage pro line horns and even pro line horns made by Selmer Paris today, they simply go numerically higher as the years advance. The serial numbers do not differentiate from alto tenor Bariton Sopranino whatsoever. It simply depends on which horn was manufactured next, depending on their orders to produce them. So you can have a tenor 116748 and the next horn an alto at 116749, Circa 1964 on the serial number chart. In other words there are no horns with the same serial number, one alto and one tenor.
Selmer USA simply is a stencil of a taiwan producer today. No horns are made in the USA anymore. You can even get your own stencil from a Taiwan producer today. I believe Tenor Madness has a stencil from a German or Belgium producer and Saxquest has one from Taiwan.
I hope this helps. I am not familiar with the serial number lists of todays horns. I deal mostly in vintage American horns, and vintage European pro line horns. But you can contanct Selmer/Conn and they can probably help you by a phone call if nobody steps forward and directs you here.