Amazing that I never saw this thread before.

I'm a multi-instrumentalist, and own and play a number of stringed instruments, plus harmonicas.

Guitars, steel-strung flat-top, archtop, classical, and electric
Guitar, 12-string
Guitar, Hawaiian
Guitar-banjo
Banjo, 5-string, fretless
Banjo, 5-string, fretted
Banjo, 4-string tenor
Banjo, 4-string octave mandolin
Banjo-mandolin (8 strings)
Ukulele, soprano, concert, tenor, and baritone
Mandolins, A-model, F-model, and flatiron-style
Autoharp
Appalachian dulcimer
Hammered dulcimer (inactive currently)
Fiddle
Harmonicas
Jew's harps (from several cultures)
Bones & Spoons (poorly, if at all)
Tambourine (also poorly -- my arm gets tired quickly)

Folks who know me -- have I left anything out?

Bob Clayton