Here is a Walden set I put together recently out of mostly NOS sockets, some with a bit of residual cosmoline, that would be an exact specification matching set for late WW2. This set would have been included in the General Mechanics Tool Set from 4/45 through the end of the war. For some reason the government changed the spec to include only 6 and 8 point sockets, as well as doing away with the ratchet, extension and crossbar. Towards the end of the war Walden was going away from their previously produced knurled sockets to a style with the two slots. Most sets contained a mix of the two styles.
-Don