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It comes from the inside of a vintage book, might be thicker than the original font because of the ink.
Looks like Scotch Modern, often used for old scientific reports.
Top quality digital by Nick Shinn http://www.myfonts.com/fonts/shinn/scotch-modern/
...also very close to Worldwide, again from Nick Shinn 
Thanks a lot, I was just comparing it to a Century Bold Condensed, it's really close, but also close to the Scotch!