If the attic weren’t full of cranky wasps, I’d go up and check what real Underwood number keys look like.
[it’s raining and they’re all staying inside for the day]
That’s just one Underwood font, though.
There are lots of them.
I would imagine that one of them truly replicates the old typewriter.
http://www.fonthaus.com/products/fonts/view.cfm/sku/VT10050
Totally different style numbers on this one.
Thanks for the link, it’s a much better match to the letters and the numbers.