Value of knives?

More than likely yes. If you do any mods like removing parts or cutting something down then it will more than likely decrease value if you plan on trading or selling at a later date.
 
Ditto what Hawk45 said. If you are really collecting, and you've got an antique knife, don't touch it until you've had it positively identified and appraised. Even then, probably don't touch it. This is true of most real collector, but it is especially true of japanese swords. A lot of people have made the mistake of taking Grandpa's sword he got in Japan during WWII and getting it polished and sharpened by the local knife guy. In most cases, it didn't matter because the sword was a WWII-era factory blade (Showato) which was worthless anyway. But in some cases, Grandpa brought back a 17th century Shinto katana, worth hundreds of thousands of dollars to the right collector. After getting sharpened and polished by the local knife guy in Bumblef***, USA, it was worth $0.
 
most certainly yes. This seems to be common sense to me, as it doesn't just apply to knives and swords, but anything and everything you could possibly collect.
Like cars. If you had a vintage Dodge Charger and you put $50,000 in modifications into it, it would still be worth less than the original stock car.
If you plan on collecting, don't even sharpen those knives.
 
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