Could be a really nice trim, or a mistake.
The edge quality is the thing to look for. The front should have a slight curve towards the side, and the back should have a tiny ridge towards the back.
A bit of very minor chipping on the back all along the edge is a good sign too.
Those are the basic traits of cardstock cut on a guillotine cutter especially for the 1910 era. Modern guillotine cutters cut a bit more crisply
The typical trimming will have very sharp edges front and back. Or a sharp edge front and a bunch of chipping on the back.
The usual tools for "good" trimming are either a sharp blade (Xacto, scalpel, single edge razor etc) Or a shear type paper cutter. Neither will make quite the same sort of cut the pro equipment will make.
Be sure to especially check the corners, as they can be rolled larger and cut back to match the sides.
Steve B
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