This Act shall apply to every unlimited company registered in pursuance of the [42 & 43 Vict. c. 76.] Companies Act, 1879, as a limited company, in the same manner as it applies to an unlimited company registered in pursuance of this Act as a limited company:

Provided that reference, express or implied, to the date of registration shall be construed as a reference to the date at which. the company was registered, as a limited company under the Companies Act, 1879.