I am the original owner of this Monkey Wards Powr-Kraft 3/8" 6-point socket set. As best as I can recall, I got them around Christmas 1967, I asked my parents for a set of metric sockets and open-end wrenches so I could work on the 1962 VW Cabriolet my parents had bought new (it cost $2225, when you could buy a VW bug sedan for $1700).
This set looks to be identical to SteveH-CO's post. I also have a set of double-open end wrenches from the same tool line. I still use the socket set to work on my motorcycles and my late-model GMC truck, or any other metric item. The ratchet has stopped functioning, but I still have it squirreled-away in a tool chest, I had to dig it out for the pic. The ratchet doesn't appear to have any snap ring to remove to be able to disassemble the head. I'd rebuild it if I knew how it came-apart, or where to get innards.
Over the years, pieces have failed, the 8 mm & 12 mm sockets failed, replaced by Craftsman pieces. I also have a vintage Proto deep socket for narrow spark plugs on motorcycles, it's in the box. The set didn't include a 16 mm or 18 mm socket, but went from 7-19 mm. I bought the 16 and 18 mm sockets separately. So, the set is about 50 years old, and for the most part, is still going strong.
When I first got the set, I got some sheet cork gasket material, and cut pieces to fit in the bottom of the steel tray. They are still there, after 5 decades.