Tatsunobu is correct, Haynes 9497, Wakayama - I - pg. 43
My two cents. For this price it 'MUST' have at least Hozon paper. Any self-respecting dealer, especially in Japan will provide this. If not, gimei is implied. Darcy had an NBTHK papered Teruhide F/K several years ago for ~$6500. I've seen way too many gimei Omori wave pieces to have any trust in an un-papered one.
BTW - There is one mei example in Wakayama - bottom left:
Just my opinion.
PS: If you are looking for 'Masterpiece' works yes, they would be 'Juyo' level and be tens of thousand of dollars, possibly more but that is not what we are looking at here.