Pretty sure I own the first one of these knives made, which was featured in a news article and predated the production run of 20 knives.
https://bitcointalk.org/index.php?topic=941287.msg10340032#msg10340032In any event, a great piece and rare find in good condition. Good luck with the sale. Mine has definitely seen some wear as it is regularly handled.
EDIT:
...originally sold for about $200 here on the forum.
...snip...
I have been collecting and trading knives for many years and would value it at about $500 max.
This is a pretty common problem in the crypto collection community of trying to value things in BTC over time instead of USD. You get people asking $14,000 for a $500 knife (I'd value it a bit higher but my opinion is biased). Always wise to check the original price paid in USD when buying a previously owned item.