27. Design of registered property mark
The design of a registered property mark may be borne by one or more hammers. When the design of such property mark is borne by more than one hammer, each hammer after the first shall be numbered serially from the number 2 onwards, to denote that it forms one of a series of hammers registered as the same mark. No additional registration fee shall be payable in respect of such additional hammers, but any modification or alteration, other than the addition of such number, in the design of such mark shall be separately registered.