1. Remember that as a Registered User, you can't get too close to offering a knife for sale here, and certainly not in a discussion forum. Please read the
FAQ and the membership information:
2. If you hold the knife to sell at a possibly higher dollar
price later, you may find inflation has reduced the dollar
value of your sale. In any case, you aren't talking about a high-dollar item, so the sale price would be relatively little, quite likely less than the original price in any case.
3. If you do decide to sell, study successful ads here and on eBay, for example. Good pictures put buyers at ease. Clear and complete descriptions do, too. Well-written ads use good grammar, spelling, punctuation, and layout.
Be patient. A knife you think is worth a lot may not attract buyers immediately. Give it time, perhaps drop the price if you find similar knives are going for a bit less. But wait, wait ... the right buyer may not have seen the ad yet and when he does, it's the knife he wants and you've got your sale.