Imprimatur from plate 58, 9 May 1845
Plate 58 (die I)
For a closer look at die I click here
By official regulations, whenever a plate was laid down, an impression on the same watermarked paper and in the selected colour to be used for the issued stamp was submitted to Somerset House for approval. This sheet, when approved and placed in the archives, was known as the imprimatur sheet. Some stamps have been removed from the sheets and end up in collections.
It shows part of the selvage marking "of 12. £1.....Per S" the full inscription reads:
PRICE 1d. Per Label. 1/- Per Row of 12. £1... Per Sheet. Place the Labels ABOVE the Address and towards the RIGHT HAND SIDE of the Letter. In Wetting the Back be careful not to remove the Cement. see SG 43
Position of corner letters "AC" on the plate of 240 stamps
| AA | AB | AC | AD | AE | AF | AG | AH | AI | AJ | AK | AL |
| BA | BB | BC | BD | BE | BF | BG | BH | BI | BJ | BK | BL |
| CA | BL | ||||||||||
| DA | DL | ||||||||||
| EA | EL | ||||||||||
| FA | FL | ||||||||||
| GA | GL | ||||||||||
| HA | HL | ||||||||||
| IA | IL | ||||||||||
| JA | JL | ||||||||||
| etc | etc | ||||||||||
| . | . | ||||||||||
| . | . | ||||||||||
| . | . | ||||||||||
| RA | RL | ||||||||||
| SA | SL | ||||||||||
| TA | TB | TC | TD | TE | TF | TG | TH | TI | TJ | TK | TL |