That's certainly the pin most people (including me, when I still had a Stratoliner) use on their Stratoliner bow.
However, i've always had my doubts. A Stratoliner has 2 engines on each wing, being the major worry. Therefore the plane this pin represents is not a Stratoliner! Given the length Stetson went to with the marketing and production of this hat - all the images and drawings they used had 2 engines on the wing, for example - would they really have released it with a pin with only one engine. It just never squared the circle for me. But the true believers are certainly out there.