Socket Logo ID

[DWise]

A 75 year old friend gave me a set of sockets and the only marks are on the two largest sockets. Anyone recognize the brand?

 

[63Plymoutlh]

Duro
http://home.comcast.net/~alloy-artifacts/Photos/tools/duro_early_12dr_6pt_cropped.jpg

 

[DWise]

Thanks, that was a quick reply and I liked the link, it was a good read.