Help ID Old MAC Tool Box

[Farmall 1066]

Bought this old box on an auction Saturday for $7.50. Smelled like mouse piss, and was covered in grease and dirt. Casters all gunked up and stuck.
Quick blast with the Hotsy today, and took out slides and cleaned and lubed them up, and got them sliding like new. Cleaned out the casters and got them working ok.
One drawer had some broken spot welds I had to tack back up.

Can't find any information on this one. Any ideas as to age? I suspect it was made by Waterloo, but not sure.

 

[zkling]

Take a picture of the drawer slides. Check the bottom front frame rail as well as the back and sides for a stamp.

 

[Ponchoguy]

I think that's a Stanley Works (Mac) box. I don't think Waterloo made them for Mac back then, but I could be wrong about that. Waterloo is pretty good about ID'ing their old stuff.