Punctured Small "OS"
Issued from 1924 with 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"
All stamps below are listed in value order
1-17-1 SOS 2/- Maroon, Small OS Official;
1-18-1 SOS £1 Grey, Small OS Official
