>An earlier set wont have lip or retention clip.
Like D57775 ?
I think I have seen those sockets and assumed they were New Britains since
they kinda look like they were made on a screw machine....
Do not have any tho....:(
It is interesting that there are earlier patents for roller bearings by a David F. Graham assigned to New Departure (Probably the second largest maker of bearings in the world at the time), I wonder if it is the same fellow, and if he got in trouble for it? chuckle...