1950-52 1d pale ultramarine, unique horizontal tête-bêche marginal Registration block of 48 spanning the sheet with 11.5mm vertical gutter margin between two tête-bêche blocks of 24, printed margin number 009270 in the gutter margin

Printed Registration Certificate on the reverse with manuscript entries reading:

“THIS sheet (240 set) of 1d. Book stamps WAS TAKEN IN THE PRESENCE OF THE POST OFFICE CONTROL OFFICER AT THE FACTORY OF Messrs. Harrison & Sons, Ltd. AT High Wycombe, Bucks FOR REGISTRATION OF THE FIRST PRINT OF 1d. Book stamps (240 set) in blue

(Signed) Powell
CHIEF EXECUTIVE OFFICER
10 Janry 1953

(Initialled) HWP
INITIALS OF THE CONTROL OFFICER
SUPPLIES DEPARTMENT
STAMP DEPOT”