Odd Socket wrench from Boeing Surplus

I have been trying to spend donation moeny at Boeing Surplus for the last 2 weeks. We have 1 week left and besides a HUGE score of aluminum today it has been pretty tedious.

With no large items, that we can use, available from Boeing it is a bit of a challenge to spend this money.

I have been buying box after box of air tools from the toolroom and anything else from the main floor that is at all interesting.

I have been buying a LOT of socket wrenches, and box-end wrenches of all sizes.

I tend to just fill buckets without bothering to size the items.

I was sorting a lot of them today and discovered a very odd socket.

The socket is marked in SAE and Metric.

I have never in my life seen a socket of this size or ever seen a nut it would fit. One of the sockets was made by Easco and the other by Armstrong.

Just wondering if anybody has ever seen one before.