Need Some Help IDing a Vintage 3.75" Robot

[pedro12345]

Hello guys. I'm new to this particular forum, but a veteran of other collecting forums.  I'm guessing I've run into some of you on other boards.  

My question is that I found this little guy at garage sale for $5.  He was label a "GoBot" but certainly doesn't seem to be.  I'm not well schooled on Japanese Robots, so I need some expertise and help identifying exactly what this is.  It's about 3.75" tall with a metal body and plastic head, arms & legs.  It seems to be a Popy, but I've got no idea what "model" or when it was created.  The only marking is the word JAPAN on the back below the screw.

Any help you could provide would be much appreciated.

[Mr. Ginrai]

Shogun Warriors Mini Poseidon by Mattel. The figures in this sub-line were 3.5"-3.75" and made of plastic and diecast. This one is pretty common. It's in good shape and not floppy. I'd say it's worth about $10.

[pedro12345]

Thanks for the info. Just looked up the line - very cool. I might add a few of these along side the GoBots!