Anybody know when they started making them? I was cleaning up my tool box today and found a date stamp on the bottom of the frame (I think that's what it is anyway) 2-71. The frame is gray with red drawers. I've been thinking of replacing the side box that I have hanging on there. I thought it would be kind of neat to find a matching one to hang on there. If they made a side cabinet in 1971 that is.