Unidentified

"Monier" 6 inch

I have not been able to identify either this 6" (5" scale) rule, or the company stamped on its thin leather case. The blank back has an unusual little window through which the S,L, and T scales are read - I've only ever seen such a thing on Aristo rules, but this doesn't look like one of theirs to me.

Anonymous Made in Japan

I can't find anything like this 10" rule on the web, though I think it has some of the look of a Blundell. It's very cheap feeling, flexible and flimsy due to the open-frame design. The vinyl case is thin and fragile, and the instructions are on rice paper. There is no indicator on the back to read the trig scales - apparently the edge of the rule serves that purpose.