From Dr. Drew Hause's site, http://www.picturetrail.com/sfx/album/view/17575181 , as a full screen, 2nd full row of barrel flats, 1st pic entitled "Post 1924 Dumoulin Lambert" has a very similar date code stamp with the same spangled "x" controller's mark. Drew gives 1928 and it could be "y" and 1946. Quite a puzzle I must say.

Kind Regards,

Raimey
rse