Antique Meiji Period Japanese ivory netsuke of Noh Actor with revolving face, signed by Wayama(?)

This fascinating 19th century Meiji period ivory netsuke is highly unusual in style and depiction.
We have been very fortunate to come across some excellent antique ivory netsukes lately; these Noh netsukes are rare and highly sought after.
The highlight of course is the Noh actor’s revolving faces, switching from the actor’s face to a demon (hanya) mask. Face-changing is an integral part of Noh drama and the cleverly done expressions add a touch of levity to this charming piece. This one has particularly well-carved expressiveness as well as a finely carved staff.
Signed to base but the hiragana is either slightly rubbed or an archaic character, possibly Wayama.

Price marked at $1500 AUD.
Dimensions: 5cm high, 2 by x3 cm base measurements.
Very good antique condition with mild signs of wear commensurate with age and use.