no Fred, the term "1st series" applies to either a 47 Deco or a 55 AD, the term "2nd series" designates either a 47 AD or a 55 TF, but then you knew that .... some of the suppliers call all the TF years "2nd series" because they don't pay any attention to the 47 1st and 2nd
folks that don't understand the 1st/2nd situation [not you Fred] should read up on GM post war production and labor problems in the auto industry

Bill