The earliest Canadian Marconi receivers were given ascending Roman numeral model designators. These Roman numerals are also referenced  here along with their  corresponding Arabic numbers.

Type:   4 tube  TRF set
Circa:  1924
Tube Lineup : ?
Power Input :  DC operated.
Original List Price: ?
Comment: It is believed that the Model !V was a chassis only. As if 1924 , it became a TRF set which used 4 tubes. 

Looking for a Model IV (4)  photo and schematic. Contact:  jerry.proc@sympatico.ca

Credits and References:

1) The Early Development of Radio in Canada 1901 to 1930 by Robert Murray

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July 23/17