3963) Royal Observatory Greenwich (ROG), United Kingdom (UK): A set of postage stamps issued by the Royal Mail (UK) celebrating 350 years of the ROG by honouring the clockmaker John Harrison’s Marine Timekeepers: Date/Year of Stamps issue: 12.06.2025:
Honouring prize-winning clockmaker John Harrison’s Marine Timekeepers – A four-stamp miniature sheet celebrating his perseverance, determination and ingenuity.
Four First Class stamps showcase each of Harrison’s prototypes for measuring Longitude at sea that became known as H1, H2, H3 and H4.
H4, defying conventional wisdom by adopting a watch design went on to win the 1714 Longitude Act just three years before his death after a dispute over the criteria.
The next generation of clockmakers subsequently developed Harrison’s ideas into the marine ‘chronometer’ that became an essential part of navigational practice in the 19th and 20th centuries.
The Postage Stamps:
The Stamps:
1st Class: Airy Transit Circle Telescope
1st Class: Flamsteed House
1st Class: Great Equatorial Telescope
1st Class: Annie Maunder Astrographic Telescope
1st Class: Prime Meridian
1st Class: Shepherd Gate Clock
The Presentation Pack (PP)
The First Day Cover (FDC)
The First Day Cover (FDC) affixed with a Cancelled Miniature Sheet (MS)
A Collectible (C)
A Medal Cover (MC)
Technical details:
Issue Date: 12.06.2025
Designer: Steers McGillan Eves
Printer: Cartor Security Printers
Process: Lithography, Gum
Size: Olympic Landscape, 60.00 mm x 30.00 mm
Values: 6 x 1st
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