Many of the best deals are the ones that you do not make. Spending 7K or there about, on a gun that will see very limited action is one of them. You are trying to think like a collector and a shooter at the same time and it does not always work. If you want a rare or high condition gun buy it and keep it pristine. If you want a good shooter pass on this one and find one who has already had most of the condition worn off by heavy use. Why pay half the price for condition unless it is pristine and you just want another closet queen?
If you could use it ten times a year over the next ten years it should still be a 90% gun. If bought that gun will live in a closet or safe. It has limited use potential, is too nice to take into nasty places or in heavy weather. You will not use it to shoot clay targets. It is a great duck gun with shells that cost three dollars a pop.