Without reading any of the other responces, I will voice my opinion.
'Pre' model # xx means some silly bas**** is too damn lazy to describe
a gun as it was before model numbers were assigned in 1957.
Examples; ;
Combat Magnum.
Combat Masterpiece.
K-38 Masterpiece.
Model of 1955 Target, 45 caliber.
THE 357 Magnum. Basically denoting any N frame 357 produced
prior to model marking of the model 27.
The Highway Patrolman.
There is no such thing as a "PRE" model anything.
Considering that the named models existed long before
models were numbered.
Rant over. Thanks for indulging me.
Regards , Allen Frame