Lots of good readable dates and logos
That certainly is a very clean specimen with very nice, legible markings. (Even the owner's mark is appealing!)
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As I have noted before here, I have side-cutters (my 4-1/2" and 5-1/2") with the exact same markings. The 1890 and 1892 patent dates around the pivot, the 1907 and 1913 patent dates on the handle, the "St Bernard" dog logo on the opposite handle. With no model number. No size marking.
But I also have side-cutters (my 8" and now my 6-1/2") with very different markings. They have the model number followed immediately by a hyphenated size marking (e.g., No, 102 - 6-1/2) around the pivot, with the patent number (1,064,956). No patent dates, no "St Bernard" logo. See Post #102 above for photos of these markings.
Note that that patent number is the June 17, 1913 patent, which is the latest patent date of the four patent dates on the other style.
I think we can conclude that means that at some point Wm. Schollhorn decided to eliminate all the utility patent dates, ignore the early obsolete patents altogether, and just mark them with the latest patent number. Because the 1942 catalog shows images of the pliers with the four patent dates, I think we might further safely conclude that the pliers with the model number-size, 1913 patent number, and no dog TM were later in the 1940's.
Here is the reason my display board planning was piss poor! I knew there were only four (4) sizes and I should've known I would find them all eventually. I am going to have to re-arrange some placards to make room for the 6-1/2-incher.