Don’t see many of these around. Lots of 3 reed. Notice he’s using a hose clamp to attach it to his bike. Sometimes I feel a little wary of leaving my bike locked up somewhere because I’ve just got a wing nut holding my big brass 14″ horn on. You know, maybe it’s something someone would rip off. A hose clamp would certainly slow them down at least. There’s a 3 banger over at Amazon (affiliate link).