Err...now let me think!:

Guitars: 6 (Lakewood Custom M-18, Regal RC-1, "no-name" jazz archtop, Paul Belgrado custom solid electric, old Antoria classical, 1890s French parlour guitar used exclusively for slide
Mandolin: 1 (Gideon Weigert, Nottingham, UK)
Octave mandolin (or mandola, depending which side of the pond): 1 (Terry Docherty, Newcastle, UK)
Piano: 1 (Upright Zimmerman, Germany)
Mountain dulcimer: 1 (French, handmade...can't remember the maker offhand)
Fiddle: 1 (old, probably German)
Bass: 1 (electric, Cort)
Latin percussion set (congas, bongos and multifarious assorted percussion pieces): 1 (mostly Meinl plus Oxfam Fair Trade)
Djembe: 1 (Ivory Coast)
Wooden D flute: 1 (Belgian, Riccardo Von Vittorelli)
D whistle: 1 (Chieftain)
Balalaika 1: (bought in Moscow, late 60s)
Harmonicas: several (all Hohner)
Mouth-blown "Thai organ" (no laughing please): 1

Amps: 4 (Trace acoustic, Laney acoustic, Behringer bass, Torque 30W practice amp))

Plus of course all the cases and containers of the above:

There may once have been (in fact, definitely were) far more but marital continuity and house repairs dictated reluctant disposal thereof!

Peace

moo