It could be fake, I’m not sure how prevalent fakes are. Assuming its real, it seems to be post-1970s since it doesn’t have a star, and I’ve read more exact dating is hard due to the lack of serial numbers. I found an odd “9” behind the part you put your mouth against when taking it apart to see its condition (which it’s condition is very poor imo), and I wonder if the exact order or dates of the listed grand prix can give a more precise date.
It lists “GENEVL 1927” (Geneva?), “PHILAD.1926”, “PARIS 1937”, “CHIC 1893”, in that order. Was there even a grand prix in 1893? I found nothing online about a 1927 Grand Prix in Geneva. Is this a fake Hohner? Or just odd?
I’d attach images of front and bottom instead of just bottom, but I couldn’t. The front just has it’s title “THE ‘CHROMONICA’ (CHROMATIC HARMONICA)”, and a “MADE BY M. HOHNER GERMANY”.