The original .357 Magnum was prior to model numbers being assigned.
It was advertised and cataloged as "The .357 Magnum."
After 1957 it was the Model 27, NOT the Model 29, which was the .44 Magnum.
S&W dropped the registration certificate process in 1938 or 1939.
The "unregistered" magnums made from then until when production shifted to a war footing are actually rarer than the registered magnums.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.