Wow, can't say I've ever seen one of those...

Have seen lots of 5-20's, the typical 20 amp t slot on the neutral, grounded outlet.

I take it there were no electric stoves or dryers until the late 60's?

Looks like you could fit a NEMA 6-15 plug into that receptacle.

I believe some of you have mentioned at one time washers required one of those austrailian looking receptacles?

Lostazhell you have one of them you got from that woman's house in Compton...it's a duplex outlet....top part has the aussie style configuration with ground, bottom is typical dual t slot receptacle with no ground....was that one in the laundry room?