In my case it would be my lovely Gibson J50 that I bought 2nd hand from Selmers in Charing X Rd, London some 38 years ago. It never lets me down. I paid around £95 for it, which seems peanuts now but in 1967 must have been a considerable sum now I come to think of it. I love its easy playability & warm tones, particularly at the bottom end.

The J50 replaced a blonde Levin jumbo that was stolen from my Earls Court bedsit back in the mid 60s. Before the Levin, my best guitar to date had been a rather dreadful Gallotone ' Champion '(the sort that John Lennon owned in his Quarry Men days & which fetched some unearthly figure at auction a few years ago).

I also enjoy the luxury, for me at any rate, of a 2nd decent guitar ; a Gallagher. Lovely clear tones, great bottom end, so easy to play and very well made to boot. But, on balance I think it's the J50 that I would want to have with me on that proverbial desert island !   

Dickie