Maitre HR

Ted wrote to me about this one:
Maitre at the bell but it looks like it was hand Etched.
It has a seial number of 58546 stamped in the bottom section.
40's 50's case like you have mentioned.
It also has the pinned hole on the left pink key that you mention.

There is a wooden instrument that was stamped with the same name.

To me, the case looks 40-ish, or even might be late 30s.