I am a bit confused on the PS Manufacturing/PSW history and timelines. To me Dales trap looks like a very early PSW? Were all PSM traps before PSW`s or were they both produced at the same time?
In the "Steel Trap in North America" book, Gerstell states Peck Smith Manufacturing merged with two other companys in 1870 to form the Peck Stow & Wilcox Co....If that is the case, I doubt the PS MFG traps came to an abrupt stop at that time. I would think it likely that they kept making them and added the #0, #3, and #4 size slick pan PSW traps. At least until the PS MFG. inventory ran out.
I think there are some pretty gray areas in Gerstells info on these trap companys. He also describes the PS & CO. traps with raised letter pans..
Probably rarer than "trapper48"s #1 cast pan Crescent.