Hi Nicolas, this was a little hard to identify at first, but this is two separate plastic stencil press alphabets being used simultaneously. You can tell by the two different ‘A’s and two different ‘Q’s.
The “uppercase” is the ScotchKut Raised Modified Roman
The small-caps, or smaller uppercase is the PALL or Cutrite*: Modified Roman Raised
Things like this happened when a shop had both sets but not in each size needed, so the inscription can be mixed.
* There are extremely small differences in the characters of the PALL and Cutrite versions so it’s unclear which version it is–though the punctuation was largely different.