Robuta

https://www.campaignasia.com/article/new-campaigns-an-audible-call-to-action-for-bugle/0srwe8hwvj92dr3xxhaele8t4e

https://www.answers.com/collecting-hobbies/How_much_is_an_old_Koch_Bugle_Call_harmonica_made_in_Wurtemburg_worth

https://www.viz.com/shonenjump/the-bugle-call-chapter-2/chapter/46684?action=read