its simply a matter of buyer (collector?) interest. Some folks seem to think everything old must be valuable. Others know better.
Quite simply it is supply and demand, and demand depends on popularity. And, popularity at the time you are looking to buy, or sell.
Have some popular movie action hero use one (or the villain use one) and you can find the price jumping, maybe even double, almost overnight.
If there's no particular demand, or a low stable demand, prices stay about the same, adjusted for our money's value.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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