Australian Online Stamp Catalogue
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1924 Kangaroos
Designer: William Blamire Young - Engraver: Samuel Reading - Printers: T. S. Harrison
Watermark 44 - Small Crown over small letter "A" 
The perforation has been listed as 12 or 11½ x 12, the actual size is 11.7 x 11.8 closer to 11¾ or 15 holes per inch.
Except for the 1945-48, 2/- stamp, one die was used to print ALL kangaroo stamps, the value was simply changed by
the insertion of value "plugs."
Issue as shown in brackets, with perforation 11.7 x 11.8
All stamps below are listed in value order

1-17-1 2/- Maroon, (1 May);
1-18-1 £1 Grey, (1 May)
images below courtesy of Steve Irwin Stamps - Quality Australian & New Zealand Stamps
Specimen Issues
This £1 stamp was issued with three different font's

1-18-1a SPEC £1 Grey Specimen Overprint 
1-18-1b SPEC £1 Grey Specimen Overprint
1-18-1c SPEC £1 Grey Specimen Overprint