I've spent some time reviewing old fire brigade photos to see if I could identify the location based on the uniforms. Two things I've noticed so far:
1) Fire fighter uniforms of the period appear to all be the same at first glance, but a combination of small details actually make these uniforms somewhat unique; and
2) These men are awfully slender for fire fighters, especially of that period.
![Huh ???](https://www.autopuzzles.com/forum/Smileys/default/huh.gif)
And the same can be said of that fire engine.
Unfortunately, neither observation has brought me any closer to the solution.
So... Europe?