Without a beer can in front of the tool box, it's hard for me to compare size, but I have a heavy metal tool box with the exact same top configuration and the same drawer scheme. The only difference is that my flat piece of "security" steel slides out from the bottom and hooks over the male part of the hasp. My box is a metallic blue color and and the only difference is that the flat sheet of tin for security purposes on mine comes out from under the bottom drawer as opposed to being hinged at the top like yours.
I was thinking this was a machinist's style tool box with all the thin drawers, but even as sanitary as mine is, I could still not find any trace of manufacturing markings anywhere. I think I swapped the guy like $100 worth of tools for it, but it was full of Starrett and Brown and Lufkin micrometers, inside mics, etc. I store anything is use for "measuring", including some old aluminum diameter sizing plates for produce(which will likely never see the light of day again....)
Gotta save these old beasts, that's for sure....
DM&FS