An increase in value with the passage of time for any object is not a sure thing. An increase in value requires demand. Given the demographic realities affecting all the blood sports, I question whether any double will turn out to be a good investment in the long run.
What would you like to bet that if a survey of the users of this Web site could be done you'd find that the average age is north of 45? Folks who participate on this board may be introducing their kids to guns, shooting and hunting but others are not.
Guns that have an historical association (i.e. those with a wild west background such as Colt peacemakers) may appreciate because they have value as antiques and museum pieces and their value is unrelated to their utility as shooters. But that sweet little high grade 16 gauge that constitutes your idea of a perfect bird gun? If you can afford to buy it and use it and enjoy it, then do so. But it's only really valuable to bird hunters like you who "get" it and want it. Don't kid yourself that it's an investment.
A World War II era typewriter is, in a sense, a beautiful machine-age object with intricate hand-assembly and construction that today would probably have to sell for upwards of $1,000 to profitibly reproduce. Know anybody who wants one or uses one?
