Some makers use a japanese chop(that requires research, for sure, unless you speak japanese), some makers use a symbol(Don Fogg's gold plug with cherry blossom stamp, Don Hanson's Sunfish), some makers include a certificate, or in Virgil England's case, a fob, like a keychain fob, but handmade, that is the certification for the knife...
Each maker has to decide what marks , or none to use, and each collector has to factor in how much this does or does not matter.
No one is ever going to be completely happy about this stuff, and we can talk about it forever, but in Nick's case, my original statements stand. I never liked Vince Evans' fish with the stylized "E", but people always seem to want his work...it takes all kinds.(Vince is great btw, this is not a slam on his work, just his mark)
Best Regards,
STeven Garsson