I have a couple DUNLAP's. They are light duty, for sure. And I can attest that they are thinner in every respect to the K-D miniature pliers counterparts that I also have, they are more cheaply pinned at the pivot, and, I suspect they are made from a pot metal composition, not an alloy steel.
But, I'm not sure the comparison is entirely fair. My K-D's are from the late 1930's, in a leatherette pouch, and the DUNLAP's are much later, probably, like yours, in that vinyl pouch, from at least the 50's and likely even later.
Also, and this is the most interesting part, my K-D's are marked K-D and clearly made by K-D, but they came in a FULTON pouch with a FULTON part number and they were marketed by Sears, Roebuck & Sons. The FULTON brand was not an economy line, it was their pre-Craftsman brand.
You can see the full set of four (4) K-D pliers in the K-D thread, where I already replied to your post there, Stubby.