Been after one of these funky little rats for a while, and even a blind squirrel finds a nut every so often.
They also made a 1/2 drive version, 4429.
They were discontinued at some point, and the 3429 part number was recycled for their bent flex head ratchet, which are still sold new.
This one was made in 1964. Single pawl, 41 teeth. In very good shape, I'd venture a guess that it may be unused and just has a bit of drawer rash.