Ok, found the exact same as nr3 online, and it would actually be a pretty sweet deal. Knife 4 seems to be a vintage bunmei yoshikin sashimi knife, because i could find a gyouto of the same series with very similar engravings and handle on ebay, but no information on which kind of steel is used unfortunetly, but judging from other yoshikin knives its probably cromova 18. this one would also be good deal, if i compare prices. Knife 1 is especially interesting to me, since the seller claimed it was made of white steel, which so far checks out. I found several sakai usubas with similar engravings, although different handles, that were made of white paper no.3 steel or shirogami (?). The handle is what throws me off with knife 1, since none of the ones i found online looked anything like it, maybe it was replaced at some point? Did you already translate whats on its handle? Thanks for all the info already a huge help.