Do you have a picture or any more details? It would be impossible to know without more information. Is it Irish, Scotch, American? Is it a single malt, pure pot still, blend? Does it have an age statement? What condition is it in?
DavidH wrote:I'd say somewhere in the range €30-€1,500. Maybe a little bit more or less.
Funny man David ...
But if it is 40years old that puts it in the late 60's early 70's so unless it is a potstill or rare bottling I fear this may not be overly valuable ... however we really need to see a picture and get all the label details.