I think it might have been in that era when Mac also made a couple other brands or maybe got bought, and some parts were shared between brands (different color paint).

Unless you don't intend to stock very much weight in the drawers. Those style boxes were not known for having great drawer glides. With the tumbler out you should see the locking rod and might follow it to be sure if you need any of those parts in order to make it lock. If it were me, I would remove the tumbler (retainer clip underneath behind the box face) and take it to a locksmith. These days who knows if they will take the time. You can contact Mac Tools and send those pictures and suggest it's likely a 1970-1980 era box and you want to find parts. I mention it because some bottom roll-away boxes were stamped on the bottom.

Some had sheet metal in the frame so it's a solid dolly and not an open frame dolly. That box might have a dolly-frame under it, a square frame with the four casters bolted into it, and the box sat on and was bolted to that frame. My bet is the back of the box was black-ink-stamped with the model info. Maybe by the 1990's the drawer handles were integrated into the sheet metal (no longer a separate thing). Later in 1970's the drawer handles were still blind but were cast with Mac in them, which is what your box has. Early 1970's they went with blind holes meaning just screws from the inside of the drawer.

Into the 1960's they were fastened with nuts and bolts. Every tool we create, from and to utility carts and chests, is designed with our company's automotive focus in mind.Those mechanic's roll-away boxes can be roughly dated by the drawer handles. We're proud to continue developing innovative products that meet the demands of automotive professionals. By making tens of thousands of high-quality tools, pieces of shop equipment, and tool storage systems readily available to these experts and providing the ongoing support they need, Mac Tools has become one of the most trusted names in the professional tool market. Our products are delivered directly to body shops, training centers, professional garages, and other maintenance facilities around the world by a network of more than 1,200 dedicated franchisees and distributors who operate our iconic tool trucks in communities across North America and beyond.view more. Professional Automotive Tools and Tool Truck Franchise Opportunities Available Worldwide from Mac Tools Since 1938, Mac Tools has offered professional-grade automotive tools that let mechanics and technicians work efficiently on a wide range of vehicles.

Mac tool box lock cylinder