This brass bell has an adjustable mounting strap that can fit handlebars (and other bars) 3/4" to 1 1/4" in diameter.
It has a small profile, a high pitch, and a solid construction.
Catrike has discontinued the venerable Road recumbent trike model.
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An inexpensive hitch-mount rack for folded recumbent trikes. For example, the ICE Full Fat big-tired adventure tricycle.