They made harmoniums, perhaps the coins were meant to be set into the frame of the harmonium?
Whatever the case it makes for a pretty funky design
I'm not going to sign up to the site to find out what it's worth because it's too expensive to join. I got it for NZ$5 so it wasn't overly expensive. If anyone else has an account with worthpoint or knows a value can you let me know?
found this one that sold for $7, also this one which is currently up and active on $10
This is the history behind it Here which you can use google to translate if needed.
The reverse kind of makes sense as it was a father and son who made musical instruments like the Harmonium and accordion, think of the first drum record player that had a rotating cylinder with notches on it to "twang" different strips of metal to make a melody. like the old music jewellery box's you would wind up and when you open the lid and would normally have a ballet figurine that rotates.
looks like you got it at a good price.
Restoration addict : Verdigris Removal : Zinc White spot removal : Iron Rust Removal : Silver brooch/necklace mount Removal
Yes, the one on Worthpoint sold for $45 (another Numista member kindly let me use their login) and mine is in better condition. The one you showed was slightly different, it has a circle in the middle that mine doesn't have, and 8 Euro is the equivalent of around NZ$13-$15 Thanks for the info Fluke.