Subject:Re: Signed Netsuke of rat and ball.
Posted By: Stan Tue, Dec 19, 2017
It may be the quality of your photos, but I don't see any Schreger lines. This means the material is not ivory. It might be a tagua nut (aka plant ivory).
The quality of the carving is poor. I wouldn't have known it was a rat without you telling me. Also, I question whether the "signature" is even Japanese characters. It might just be some squiggles.
The quality of the carving of the wrestlers is a little better, but my comments here apply to that netsuke as well.
Let's see what others say.