STAMPS 
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Links to all Great Britain related material are listed in the left sided navigation bar
The Story of the 2½d Prussian Blue Stamp
The 2½d Prussian Blue stamp is considered one of the great philatelic errors of the 20th century. Below, and on the linked pages, is a description of how they came about, the data supporting the fact they were an error in printing, a description of the control numbers and a listing of the known postally used stamps. I have also provided a bibliography for those interested in reading the original articles.
This section could not have been produced without the assistance of Andrew Claridge of Grosvenor Auctioneer and Valuers. Grosvenor very kindly made available to me scans of the various Prussian Blue and other 1935 Silver Jubilee stamps that have passed through their hands. The result is a stunning display, as you will see.
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Timelines and sequence of events
November 1934
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Barnett Freedman submits colour trials of final designs. Uses turquoise-blue (prussian blue) colour on 2½d stamp.
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January 17, 1935
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Final imperforate set of essays submitted. Includes two colours of 2½d (ultramarine and prussian blue). King George chooses ultramarine.
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March 1935
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The printers, Harrisons and Sons, inadvertently print and perforate some sheets in prussian blue. All except 6 sheets destroyed.
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June 24, 1935
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Busy work foreman places sheets in with good stock.
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June 26, 1935
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Three sheets issued to Upper Edmonton Post Office (134 Fore Street). One other sheet issued to unknown post office.
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July 2, 1935
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A.J. Stavridi sends secretary to purchase 2½d stamps.He notices differences in colour. Contacts Stanley Gibbons Co.
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July 4, 1935
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Stavridi buys remaining 319 stamps from Postmaster Lewis (Lewis indicates 41 2½d stamps had been sold). Stavridi mails some of the stamps on cover to friends. Remainder eventually sold to H & A Wallace, stamp dealers.
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November 1935
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H.R. Harmer, auctioneer, writes to Post Office asking whether stamps were properly issued over a post office counter. Affirmative response from A.R. Kidner (Controller of Stamp Office). Remaining two sheets in stock destroyed.
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Bibliography
Fisher HW. "Silver Jubilee, 2½d Prussian blue." GB Journal, January 1968. pp 80-81.
Hacket A. "The 1935 Silver Jubilee issue of Great Britain." Edinburgh Stamp Shop 1982.
Hacket A. "Postally used examples of the 1935 Silver Jubilee 2½d Prussian Blue."
The Flagstaff. Volume 1 1987. Pp 18-24.
Hacket A. "Used Prussian Blues." The Flagstaff. Volume 11 1992. p14.
Hacket A. "Prussian Blue on Cover." The Flagstaff. Volume 12. 1992. p38.
MacKay J. "The Silver Jubilee. Part2." Gibbons stamp monthly. July 1994. pp39-41.
Wallace H & A. "Silver Jubilee Stamps of King George V." H&A Wallace. 1937
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