1959 Queen Elizabeth II 5d blue: Imperforate at left between stamp and sheet margin. With only one vertical strip of 10 discovered showing the imperforate left side, meaning that originally there would only have been 1 error sheet with 10 examples. This imperforate 5d is extremely rare.
Printed on unwatermarked paper with a perforation of 14.88 x 14.04 (15 x 14). Quantity printed of the normal issues were 1,860,800,00, of which 1,659,878,080 were delivered to the Post Office, plus 2,904,320 with coil perforation.
A note or two on 5d varieties. Gibbons #313ab "from booklets SB34/a and 314d from booklets SB35/36a have the outer edges of the panes imperforate, producing stamps with one or two adjacent sides imperforate." Don't confuse them with this rarity. Also, on the 5d. green SG #354, the imperforate marginal variety is quite common, about A$7., produced from sheets of uncut booklet panes. It looks precisely like the stamp above, except the queen faces left and the stamp is light green; another variety not to get excited about, but scarce on commercial covers.
Thanks for the comment Doug. I use a book titled "The Australian Commonwealth Specialist's Catalogue" (ACSC), as it pertains for everything in Australian pre-decimals, unfortunately the Stanley Gibbons Catalogue only shows a simplistic collection of Australian stamps, and does not include many of the major Australian rarities. I also use the SG at times, but prefer to use the ACSC when wanting information about rarities. Some people do seem to mistaken a normal booklet for these rare errors.
I placed a small book marker on the SG page that refers to what you are describing so I can do further research on this particular error as there is not much that can be currently found.
The 10 stamps show the imperforation leading from the stamp to the sheet margin, this can only occur if all 10 are at the start of the page and all stamps are in a vertical sequence. Type A & B can only be identified by the amount of shading lines in the bottom loop of the "5" in "5d"
5 shading lines in the 5d loop showing the stamp to be "Type B". "Type A" has 4 shading lines
A normal booklet pane of 6 with left, right and bottom imperforate sides