I'm not so sure I would agree that these wings necessarily represent the later senior pilot rating just because they have been marked STERLING.
If you look, you will find a variety of interwar/pre-WWII USAAC balloon and airship NS Meyer-made wings (as well as a 1920 observer wing: http://www.ww2wings....robserver.shtml) that were made in sterling. (for another example to an early wing--link to a USAAC airship wing in STERLING: http://www.ww2wings....psterling.shtml)
That being said, I am not 100% convinced that you can really date a Meyer wing simply based on having the sterling mark. I did like Russ's exploration of the two different styles of "stars on stilts", with the multi-piece being earlier than the single piece. Still, I suspect that even that may be a rather dubious distinction as here is an example of a sterling marked senior balloon pilot wing with the one-piece star that was worn by Colonel Gerald G.Johnston (http://www.ww2wings....srballoon.shtml).
I suspect that there will be lots (relatively speaking) of variations of how these wings were being constructed in the later 30's and early 40's, and IMHO it is a bit of a quibble to argue about whether or not to call this a 1937 military airplane pilot or a 1940 senior pilot. No matter what, it is a GREAT wing.
Also, its your wing in your collection, you can call it what ever you want!
Edited by pfrost, 02 May 2019 - 09:41 AM.