I posted this at the old site and it generated a lot of discussion so I thought I'd post it here.
Not sure of era but to me it has the I was made in the 50's feel about it.
Herbrand SPJ-1426 ratcheting spark plug socket. It's for a 13/16 wrench size plug so not a lot of applications anymore.
Ratchet direction switch. This will only ratchet left or right there is no locked position.
3/8 drive or a 3/4 wrench.
Spark plug is held in mechanically by the hex it is pretty secure and easy to get the socket off the plug when done.