Yes, it would be always advantageous to the registered proprietors to mark the article so as to indicate the number of the registered design except in the case of Textile designs.
Otherwise, the registered proprietor would not be entitled to claim damages from any infringer unless the registered proprietor establishes that the registered proprietor took all proper steps to ensure the marking of the article.
Or unless the registered proprietor show that the infringement took place after the person guilty thereof knew or had received notice of the existence of the copyright in the design.
The Register of Designs is a document maintained by the Patent Office, Kolkata as a statutory requirement.
It contains the design number, date of filing and reciprocity date (if any), name and address of proprietor and such other matters as would affect the validity of proprietorship of the design and it is open for public inspection on payment of prescribed fee and extract from register may also be obtained on request with the prescribed fee.