Orchestral horn. Nominal pitch:

https://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~78160~184097/full/150,/0/default.jpghttps://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~76937~184098/full/150,/0/default.jpghttps://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~78506~184096/full/150,/0/default.jpg