SG 43 plate 175 current number 208 1874
This lovely scan shows plate number 175 (circled)
and the Perkins current number 208 (above
stamps AA and AB).
Vertical ribbing can be seen on the left-hand
margin
(you can just see five vertical marks on the left corresponding to the five
watermark lines)
You can see the marginal inscription
"PRICE 1d. Per Label. 1/- Per Row of 12. £1... Per
Sheet."
Scan courtesy Elstree Stamps
For the five watermark lines (ribbing) consult "The Postage Stamps of
Great Britain". Part 1.
Imperforate line-engraved Issues, Seymour Vera Trinder Ltd
(also very useful for historical info,
this also contains sheet markings of line-engraved stamps)