Please and thank you.

Erbar  Suggérée par Heron2001 
Alternate Gothic No 1  Suggérée par donshottype 
Abadi Condensed  Suggérée par donshottype 
Gill Sans Condensed  Suggérée par donshottype 

If you don't find a font, the closest I can tell would have been Erbar

NOT THE FONT. But it is from that time period, and similar.

Alternate Gothic No. 1, developed for ATF (American Typefounders) by Morris Fuller Benton in 1903, is very similar to 6 of the 8 letters in MERCEDES, but is a little too bold and is slightly wider. The _M_ vertex is on the baseline instead of at mid height. The _S_ has about the same diagonal, but the terminals extend further.

For the _M_ you could substitute Abadi Condensed for the _M_ in
Alternate Gothic No. 1.
For the _S_ you could substitute the _S_ in Erbar, already suggested by Heron 2001.

Or the _M_ and _S_ in Gill Sans Condensed.