stunning letters

Heavy font. Uppercase G. Stunning.
ID?

Comments

The name of the font appears to be in your image: Sans-Serif No. 5.

Not exact, but it has a heavy, machine/grotesk quality that is kind of right: La Fabrique

http://www.colophon-foundry.org/fonts/la-fabrique/heavy

@typeinfo: For future reference, please pot requests like this on the main Type ID Board:

http://typophile.com/typeid