Markings on Hohner Harmonicas

Hello all,

I’m new here and primarily joined to learn more about the markings found on Hohner harmonicas (and also how to play better!). For instance, can anyone tell me about the circular markings with things like “Grand Prix Geneve 1927” and “Grand Prix Philad” found on the Echo tremolo or the “ULM 1871” and “Stuttgart 1881” found on the Crossover? Is there any sort of resource (websites, books, etc.) where the various Hohner markings are explained?

Thanks!

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It’s a good question, hopefully someone knows. It’s not obvious from a super quick look at the hohner wedsite or wikipedia article.
I’d guess the grand prix ones refer to awards the company got.

Hmmmm… Wondering if @Boaz_Kim_Music might have any insight into this?