Ah. I wasn't sure if people were interested in tin... Though I did once write an article for Super 7 magazine on vintage Robby the Robots, so I suppose I should have guessed that there might be a little crossover with people who collect Japanese toys.
Here's a link to my web site -- lots of pics of toy robots and ray guns. Only one 'bot is from the 40s (just to clarify), though many of the ray guns date from the 30s and 40s. (Of course, the guns are all American, so may be of less interest to peeps.)
atomicbox.net/dratomic
A few sections are still under construction, but the toys are all there. Enjoy.