Hi all, I've got a very nice condition B&H Imperial 3 Valve compensating Imperial BBb bass - Made in 1967 it plays well and is a nice instrument with few (comparitively) dents! Now I've the opportunity to swap (plus some cash maybe) for a 4 Valve Imperial (1979 vintage) - visually very similar to my instrument - both are 17" bell silver plated. Has anyone any ideas on the comparitive values of the two instruments? I'm guessing my 3 valve is worth 3 to 500 quid - depending on the luck of the draw when selling it, but have no idea on the 4 valve Imp - you don't seem to see 17" bell instruments coming up on eBay these days! Would appreciate any thoughts! Cheers, Simes.