Any Idea?

Classification: 

It comes from the inside of a vintage book, might be thicker than the original font because of the ink.
Thanks !

Comments

Looks like Scotch Modern, often used for old scientific reports.
Top quality digital by Nick Shinn http://www.myfonts.com/fonts/shinn/scotch-modern/
Don

...also very close to Worldwide, again from Nick Shinn [1999]

Thanks a lot, I was just comparing it to a Century Bold Condensed, it's really close, but also close to the Scotch!