Hi !
Standard Marks of Royalty were the Chattar or the Umbrella, Chanwar or the Yaks Tail fly wisk, Nishan or the standards and Banners, Nagara or the Royal Drums.
I think one would be correct in presuming that pieces with the Umbrella or Chattar are royal pieces (provided they are old of course as imitations are not infrequent).
Just my two bits...
