Christies guideline below for the J-200 is probably their biggest underestimate then? J-200's with no provenance can go for that I think!
Gilmour’s early musical influences included the Everly Brothers and Bob Dylan, and reflecting this the collection also offers several acoustic guitars. Examples include a 1969 D-35 Martin purchased on the streets of New York in 1971, and used as both Pink Floyd and David Gilmour’s main studio acoustic, notably on Wish You Were Here (estimate $10,000-20,000); a Gibson J-200 Celebrity (1985) acquired from John Illsley of Dire Straits (estimate $3,500-5,500); and a unique Tony Zemaitis (1978) custom acoustic bass guitar (estimate $15,000-25,000).