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Webtype? You mean you saw this on a webpage? Your browser can tell you the name of embedded fonts or you can use an add-in like "whatfont" to do this. If I've lost you here, post the url and we can ID the font for you.
I know how to do that. This was a screenshot taken by Webtype and posted on their Twitter account with the date above. I was trying to find out if the above numerals are already a part of Font Bureau's library.
From their hints on Twitter, they seem to be from another foundry.
Closest I found is Suomi Slab Serif Light:
Further search might turn up something closer but this is a general match for all three numerals.