Help with identifying DOE marked with both SAE & Metric

[DadsTools]

Picked up this old wrench the other day. It's marked 1/2" & 9/16" on one side, and 12mm & 14mm on the other. No maker's marking. Anybody know who made this and when?

 

[Private Lugnutz]

Bridgeport. Probably 50's. Edit: go to DOEs thread, page 25. I posted examples and catalog references.

 

[DadsTools]

Bridgeport. Probably 50's. Edit: go to DOEs thread, page 25. I posted examples and catalog references.

Thanks, Lugz! I KNEW I had seen these somewhere on GJ but just couldn't remember where for the life of me.