No luck on axle stamps.
The cones don't even say Schwinn, Confident the hardware and axles are original equipment though. The Dural rear hub axle is the odd in-between size, like on the drum brakes and both axles have the parting bump on the ends. It has the Villiers freewheel without the Patent Number, so post 47.
The closest thing I've found for a date on the bike is the matching stamps on the tires.
I've never looked seriously into the date stamps on the 50s tires, but would guess 55?? The Breeze tire is in the 54 and 55 catalogs at least.
The Superior doesn't appear in the postwar Schwinn consumer catalogs, but the last remnant I found is where the Ladies' Superior frame(P/N 1957) is offered in this June 15, 1954 condensed parts insert.
The bike should be earlier than that with the Schwinn script brakes though...so a date on this one is still up in the air!
I finally found the Schwinn Stainless S-6 stamp on the front rim after cleaning the Thick layer of dust off.
Adjusted the seat clamp back, aired up the tires, and swapped the brake lever holes to where they'll accept man-mitts. Then took it for a few laps around the driveway...as these old brake pads do nothing when squeezed against stainless rims.