1845—Prague, Czech Republic
A drawing satirizing the Prague music conservatory (Satira na prazské hudební konzervativce) includes 2 rear-facing trombones (see below image; public domain) (Volek, pl. 315).
A drawing satirizing the Prague music conservatory (Satira na prazské hudební konzervativce) includes 2 rear-facing trombones (see below image; public domain) (Volek, pl. 315).