When it comes to "custom" knives, a lot of makers clone their own models. Look at the shop pictures from some makers, some have multiple blades blanks ready to be "customized" with different handles. Sometimes these "custom" "handmade" knives are also partially machine made.
There are no absolutes in knife making and design when it comes to "custom" "handmade" "original", etc. Meet the maker, talk to them about what they do and how they do it. Buy what you like, unless you want investment grade, then buy what is hot.
You should buy a violin based upon how it sounds and how the sound and the violin fits you and the music you play. You cannot "clone" a violin, whether from 1960 or 1793. I have a modern copy of a Strad that sounds considerably worse then a "no-name" german violin from the early 20th century.