: I'll opt for the Gallet, based on legibility, clean design and the pretty colors.
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Jeff,
Well stated and I can not agree more. So many Breitlings and other slide rule watches have such a multitude of scales that they are overwhelming. The Excello-o-Graph has only the two log scales and so is as you state, clean and legible.

A similar situation existed in my past when I used a linear slide rule in high school and college. The student slide rules I used are the pair at the top of the picture. For comparison I have included the engineering slide rule at the bottom. These were so complex that the engineering students had to take a course to learn how to use them. Overwhelming?

Try these urls to get to an article on slide rule watches, also linked below
http://biothinking.com/watch/ or
http://biothinking.com/watch/maine.htm

David