My advice, make your first purchase here on forum, from dealer/member with good reputation. You won't regret it.
I can't say much about the blade you posted, better (and more) pictures could help you to get more opinions. Looks like O-suriage Koto blade. Thin Suguha and Hamachi might suggest it has seen multiple polish. Might be showing core of the blade (as @sabiji pointed) due to that. What is the blade attribution per NBTHK?