Given the "square" brad and the fact it was for a dresser I will now agree with your date.
I use to have several pounds of "square" cut nails, from 3/4" up to 8", that I saved from my remodeling of an 1862 2-story farm house.
They came in handy when I got into refinishing old furniture and "repo'ing" old items.
A trivia "note" about "cut" or "square" nails. With their "square" flat end, they actually "cut" through the grain of the wood and thus are less likely to cause the wood to "split" like a "round" sharp pointed wire nail will.
That is the reason that many of the "concrete" and "flooring" nails are still being made "square-cut".
If you ever tried to install a tongue-n'-groove oak floor using round nails you would have a lot of grief.