The early models by Hoyer are amazing horns. They don't get the playing recognition that they deserve. This is an unlacquered yellow brass pre-801 model by Hoyer. This model lead to the current 801 and in many ways to the G10 model as well.
There are no thin spots or patchers - this horn is all original. It has a mechanical change valve linkage and the compression is quite good at 1.9. A perfect first double horn. No futzing around with a detachable flare at the early stages of horn playing.
Protec fixed bell case included