Nice find! Those are like my partial set that are marked "Made in Canada". The 1/4" extension and the slotted one with the screw holder are labeled "made in USA" with WF on the slotted and a circled V on the extension.
My Dad worked for Sears and watched the tool sales pretty closely and always bragged about the great deals he got with his employee discount on top. When he passed, I inherited the whole lot, boxes full of tools that now have a special meaning to me.
Go check the rest of your drawers, especially your sock drawer!
