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This is engraved on the bell of a Bb valve rotary tuba;

Schiller Frankfurt Germany

Is it a stencil made in Germany or a Chinese made tuba?

It looks like a Miraphone 186.

Thanks in advance for your help.

Schiller Frankfurt is a Chinese fantasy name. It triggers some imagination of German heritage, but the great poet Friedrich Schiller has no connections to Frankfurt, it was J.W. Goethe who was born there