Those might be nice to have as a set for posterity and your grandchildren's inheritance. I would speculate that if you had all 12 ANIB they would be worth quite alot of money in another 20-30 years. (Maybe) That said, I would concentrate on buying individual revolvers that YOU really like and want. Parking $10K in a NIB set and leaving it for 30 years is not the best investment. More money can be had investing other ways. More fun can be had hunting that unicorn gun you really want.

Edit: I see this thread was actually started in mid 2017. So I am pretty sure the op is not still looking for advice on these...

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