I've got a 1973 Gibson J50 acoustic, which in 1973 cost me 150 GBP. Sometime in the 1980s I was told it was worth about 800 GBP, which is pretty much what they sell for on eBay now. A while ago I emailed the Gibson history dept about it and was told a pretty typical story for that era - in the 1970s the shape was changed from the round shouldered traditional J45 look to square shoulders and to cut costs the bracing was reduced. Not, in their opinion, a collectible era. I very rarely play it and I'm not keeping it for my children, unless the value is likely to take off again. So I'm coming to the conclusion I should sell it and put the money into something that I would play and would maybe have some potential for value in the future. But ... still doubts ... any thoughts on that anyone?