I’ve never had one so can’t say for sure but in Neil Millers post about razors to avoid he advises to avoid any described as “knife”.
At this point it might be useful to know what not to buy - this would include any of the new, cheap razors that you might see on places such as Ebay. They are often bundled with strops, mugs and so on, and there are usually hundreds of listings for them. A number of different companies market them - I won't list their names in an open forum, but you can message me if you want to check-up on a brand. They are usually made of inferior steel, poorly tempered, and usually incapable of either taking or holding a sharp edge. If you need to save money, buy a good used classic razor from a trusted vendor that is shave-ready, or stick with the tried-and-trusted makes such as Dovo, Thiers-Issard, etc. However, the old classic razors often out-perform (in my opinion) good new razors.
I can only quote Neil Miller from the excellent guide he wrote for us.
Boab very kindly asked me to write a few articles about straight (aka "open" and "cut-throat") razors, so here is the first one. Others will follow with info about strops/stropping; hones and honing and the like. Please forgive the amateurish layout and writing, but I'm a restorer and honer...www.theshavingroom.co.uk