A stamp to celebrate Team GB's gold in the rowing men's four will be will be on sale by lunchtime on Sunday.
The honour will be the first time Royal Mail has issued stamps on a Sunday.
Royal Mail will produce the stamp - celebrating Alex Gregory, Pete Reed, Tom James and Andrew Triggs Hodge's success - within 24 hours.
A fleet of 90 Royal Mail vehicles will deliver the stamps to more than 400 post offices by lunchtime tomorrow.
Royal Mail will also paint a red post box gold in each of the men's home towns of Cheltenham, Chiswick, Wrexham and Hebden, North Yorks.
This is the ninth gold medal stamp to be issued by Royal Mail.
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London Olympic Games - Day 6
Great Britain's Gemma Gibbons celebrates beating Netherlands' Marhinde Verkerk in round of quarter final match in the -78kg category at the ExCel Arena, London.
London Olympic Games - Day 5
Great Britain's Andy Murray celebrates winning his Third Round match of the Men's Singles at the Olympic Tennis Venue, Wimbledon.
London Olympic Games - Day 5
Great Britain's Bradley Wiggins celebrates after winning the Men's Individual Time Trial on day five of the London Olympic Games at Hampton Court Palace, London.
Germany's Max Gunthor (15) celebrates during the team's 3-2 win over Serbia during a men's volleyball preliminary match at the 2012 Summer Olympics Thursday, Aug. 2, 2012, in London. (AP Photo/Chris O'Meara)
The Netherlands' Mink van der Weerden celebrates his second goal against Belgium in the men's hockey preliminary match at the 2012 Summer Olympics, Wednesday, Aug. 1, 2012, in London. The Netherlands' won 3-1. (AP Photo/Bullit Marquez)
Canada's men's eight rowing team member Jeremiah Brown celebrates his silver medal at Eton Dorney during the 2012 Summer Olympics in Dorney, England on Wednesday, Aug. 1, 2012. (AP Photo/The Canadian Press, Sean Kilpatrick)
Canada's men's eight rowing team members Will Crothers celebrates his silver medal at Eton Dorney during the 2012 Summer Olympics in Dorney, England on Wednesday, Aug. 1, 2012. (AP Photo/The Canadian Press, Sean Kilpatrick)
Italy's Daniele Molmenti celebrates as he crosses the finish line in the final of the K-1 men's kayak slalom at Lee Valley Whitewater Center, at the 2012 Summer Olympics, Wednesday, Aug. 1, 2012, in Waltham Cross near London. Daniele Molmenti won the gold medal in the event. (AP Photo/Kirsty Wigglesworth)
Italy's Daniele Molmenti celebrates as he crosses the finish line in the final of the K-1 men's kayak slalom at Lee Valley Whitewater Center, at the 2012 Summer Olympics, Wednesday, Aug. 1, 2012, in Waltham Cross near London. Daniele Molmenti won the gold medal in the event. (AP Photo/Kirsty Wigglesworth)
Great Britain's Peter Robert Russell Wilson celebrates making the final with Hungarian Richard Bognar (left) after finishing the Double Trap Mens Qualification at the Royal Artillery Barracks, London.
Song Dae-Nam of South Korea celebrates after winning the Men's -90kg final match fight against Gonzalez of Cuba in the judo competition during the London 2012 Olympic Games in ExCeL at the London 2012 Olympic Games, London, Great Britain, 01 August 2012. Photo: Michael Kappeler
PA | Posted: 04/08/2012 15:59 Updated: 04/08/2012 15:59