Here is an interesting one that is almost never seen outside Japan, an Ichimonji 270mm hamokiri in Blue#2 steel. It is from their montanren line, the highest non-honyaki series, and is very impressive to see. Although made to prepare eel and cut through thin bones in the fish, I find it can also be used as a long usuba with practice (I've seen Rokusaburo Michiba do katsuramuki with one). The blade height and thickness are only about 0.5mm thicker than my 210mm usuba.
I bought it direct from Ichimonji 3 years ago, but have only used it a few times and have not sharpened it. Condition is new. The prices for these are usually astronomical (go take a look at Ichimonji or Konosuke), but I'll offer this rare knife for what I paid back before the steel went up and the dollar tanked (almost half current price).
Hamokiri - $375 shipped CONUS
The next knife is a 180mm Monzaburo honkasumi blue#2 mukimono. It is in very good condition, and has a patina on both sides. The handle is half octagon/half round (see picture).
Mukimono - $130 shipped CONUS
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