Here’s a folder containing all the photos that you may want to see
there’s no screws on this one, it has rivets, where you have a machine pressing down on the plate and securing it in its place.
Anyway, I tried unscrewing it, and one of the rivets fell off, you can see that in the pictures, and therefore I cannot take the plate off, I could break it but will never be able to reassemble it. (no music shop sells marine band harmonica in my county) This one is a Marine Band made by Hohner N 1896 key of C.
How do you clean this one?