Australian Online Stamp Catalogue
 
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1917 Kangaroo Official
Punctured Small "OS"
Issued from 1917, the perforation has been listed as 12 or 11½ x 12, the actual size is 11.7 x 11.8, which is closer to
11¾ or 15 holes per inch.
Watermark 44 - Small Crown over small letter "A"

1-13-2 SOS 10/- Grey/Pink, Small OS Official