Very interesting. Based on AJTT I thought the long clasp was the first version, but having now re-read the attached article it looks like you're right and that the long clasp was produced throughout the 1930's - probably at the same time as the short clasp. Judging by the movement no mine is c.1935/6. Unfortunately I didn't take a photo of the movement when I had it opened up.
http://www.nawcc.org/images/stories/Public articles/395_34_45.pdf
Very interesting. Based on AJTT I thought the long clasp was the first version, but having now re-read the attached article it looks like you're right and that the long clasp was produced throughout the 1930's - probably at the same time as the short clasp. Judging by the movement no mine is c.1935/6. Unfortunately I didn't take a photo of the movement when I had it opened up.
http://www.nawcc.org/images/stories/Public articles/395_34_45.pdf