The Great Britain 1935 Silver Jubilee stamps were printed in sheets of 120 stamps (20 rows x 6 columns). Normally two sheets i.e. 120 x 2 were printed at a time. Six different examples of Prussian stamps with control and cylinder numbers on them have been identified. This suggests that at least six sheets of Prussian Blue stamps were printed. This is confirmed by a memo in the Post Office archives stating that 6 sheets were printed of which 4 were put into circulation. The remainder (2 sheets less 4 singles retained as specimens) were made waste. It is known that three of the four issued sheets were sent to the Upper Edmonton Post Office.
The location of the issuing Post Office of the other sheet of Prussian Blue stamps has never been identified. Forty-three of the 47 postally used stamps have recognisable cancellations. Using the known Post Office cancellations it is possible to surmise to where a 4th sheet may have been delivered. The map of London, below, lists four of the six Post Offices cancellation sites. Five are situated North of the River Thames. Four are in reasonably close proximity of one another, whilst the fifth, Harpenden is located 20 miles north west of the Upper Edmonton Post Office. One, Westmead Corner, is situated south of the River Thames. Using Hacket's data we come up with the following information.
North
Upper Edmonton - 3 cancellations
Cricklewood - 4 cancellations
Highbury - 4 cancellations
NW London - 1 cancellation
Harpenden - 2 cancellations
It is reasonable to assume that these 22 stamps were bought from the Upper Edmonton Post Office on Fore street (One other stamp was cancelled London -it is not clear whether this is north or south of the River Thames).
South
All 20 cancellations are from Westmead Corner in Carshalton. Nineteen of them were cancelled between July 24 and July 29, 1935, approximately one month after the sheets were inadvertently placed into the regular stock. It is highly unlikely that, in 1935, someone travelled all the way to Upper Edmonton, some 30 plus miles (50 kilometres), to purchase stamps. It would thus seem likely that the fourth sheet was probably issued to the Westmead Corner Post Office in Carshalton. Why so many were mailed between these two dates and for what reason is not clear. All were single stamps. A final point to speculate upon is the fact that the only known cover cancelled from Westmead was to an address approximately two miles from the Westmead Post Office. The inland rate in 1935 was 1d.
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