Just trying to find out some more information about early Seiko movements and models. For anyone interested, I've posted a related post in Watchmaking, with a useful link to an article about early Seiko production in it. Here's a picture of one I bought recently, with a fairly disgusting case, but a nice dial – just to set the stage a bit.
As you can see, this model is designated as a Seiko Super. But they also made many models which were also called Super "S." I can't really see any difference between the two, and was wondering if anyone know if the "S" is significant or not.