My thoughts are it is much, much older than Substance's example. I figure your's from the 1850's or so.
His has a 'nail-digger' on the tang which also restricts opening. A flat edge. 20th century? Many old corn razors actually have frowning edges.
I suppose as cutting off a corn, a frown was nice?
Anyway, it is an accurate 'miniature' razor. I wonder if the ladies favored them?