Help ID These Metric Hex Drive Sockets

[Zhuk]

Sadly they don't have any brand ID on them anywhere that I can see, but they are marked Made In USA along with their size. The interesting part is that these are metric Hex Drive sockets. I checked alloy-artifacts and couldn't find these anywhere. Any idea who made these and when? Any information on these would be great.

 

[safariknut]

They look a bit like Duro or Indestro sockets.

 

[four.cycle]

they do indeed, but I'm not familiar enough with the earlier stuff to make that call.

 

[Zhuk]

Thank you. I will look into those again. Here are some more pictures. I completely forgot to photograph the wrench.

 

[GreyOwl]

Do you also have the stamped steel retainer for the set? They look identical to the set I have but mine are fractional sizes. The sockets in mine slide into the retainer and the handle locks them in.
I will try to get some pics of mine.
Mine don't have a manufacturer either.

 

[Zhuk]

I believe this is all I have for the set. I will need to double check if this is everything or not. I can't seem to find the 19mm, but I am not 100% sure it was in the set to begin with.

 

[GreyOwl]

Here are a couple of pics of my set.

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The second from the left is a hex drive to 1/4" square and the center socket has tapered serrations which I guess are for stripped heads or nuts?

 

[safariknut]

Apparently there were many manufacturers of these sets back in the early days.Here is one that is very similar to yours.I am showing multiple views to explain how it works.
First picture shows the set with the cover opened. Next is a shot with the cover closed.Third is the adapter to allow the sockets to be hooked to the ratchet and it also doubles as a screwdriver.It fits into the end of the cover in back of the ratchet.This is shown in picture 4.
Picture 5 shows the set with the ratchet in place and the last picture is with the hex handle installed in the ratchet.

 

[Zhuk]

Both look very similar. Only difference I see is the grip area on mine is split with the size and other writing in the middle. Also very strange, but mine are metric which I have a hard time understanding why they would have made metric sockets in the USA during that time. I haven't seen any others in metric.