I have run into an odd little knife. It is a Serco, 6-3/4", #53130, stainless steel, made in Japan. Very nice hardwood handle, stainless steel rivets. The pattern is like a yanagiba. It is a stamped blade, rather than forged. The knife is light and slices cukes and tomatoes as if they were clouds. I think it is made more for fish, though. Next time I cut tuna for sushi, I'll know. The blade is thin, and springy/stiff. I know Serco is (was?) in the restaurant-ware business for years+, but I can't find anything about this knife or Serco. I am assuming it was a commercial kitchen knife, and inexpensive, but it looks like the knives the guys use in the local sushi bar.