Knives and swords like many weapons even modern technical weapons need maintenance and repairs often done in the field. Also even what may be called crude by us may have been relatively expensive to the owner so would be repaired and maintained even keeping it sharp is maintenance. So it is the same with collecting just depends no whether it is good or not good. Weapons are tools that always retain a function even if you do not use them. Coins are tokens only function when in legal circulation.
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