Antique Pillow Vase hand painted- 2-sided- ball feet - with unknown makers mark

My query is primarily for the information on the unknown mark. I've spent hundreds of hours searching for this.  Particulars are;  BLACK MARK.. Perhaps under glaze.  Profile of horse laying down full view. Wearing warrior helmet on head.  Helmet has a plume (?). Wearing an armor collar and chest piece with a shield beside hime.  Under is a circle with undecipherable letters.

The vase is two sided with one excellent h.p. daisys.  T he  otherside with girl holding tray. the Feet are gold painted ball feet.  No signature.of artist.  Vase is about 10" tall.

My only interest is in a IDENTIFICATION OF mark.  Country of origin and the unknown identifying words. CIRCA IS?

Thank you for helping me.

Patricia