Hello, I have been an Excelsior aficionado for a long time, but especially since a lucky pawn shop find of a 940 a few years ago. I have already learned a lot about Excelsiors, especially from Jim D and Ventura. Thanks very much for that. I've noticed a few treble register and logo styles and wonder if they can be associated with a particular vintage. Does anyone have an idea of the approximate dates for the following? et's call them examples A ,B and C.