Apollo 11 signed flag highlights Nate D Sanders auction

An American flag flown to the Moon as part of the historic Apollo 11 mission, accompanied by a certificate signed by Neil Armstrong, Buzz Aldrin and Michael Collins, is the highlight of a sale of science and space memorabilia at Nate D Sanders that closes on September 26.

The flag is mounted to an official NASA certificate which reads: "This flag travelled to the moon with Apollo 11, the first manned lunar landing, on July 20 1969".

Apollo 11 signed flag
The certificate is signed by each of the three astronauts of the Apollo 11 mission

An identical flag and certificate sold for $47,652 in July of this year - indicating that the market for Apollo 11 memorabilia is strong.

The value of an Apollo 11 signed photo increased by 14.3% pa from 2000 to 2012, according to the PFC40 Autograph Index.

The auction also includes a rare typed letter by Albert Einstein, dating to June 10, 1938, in which he declines to write the foreword for a colleague's book. The lot includes an assortment of documents, including a photograph and a programme from Einstein's memorial service.

A letter by Einstein sent to Erik Gutkind, a Jewish philosopher, espousing the belief that God does not exist, sold for $3m on eBay in October last year.

The present sale, which began earlier this month, also features a selection of movie memorabilia.

We have a range of memorabilia pertaining to the Apollo 11 mission and this unique set of signed photographs from each of the 12 astronauts who walked on the Moon.

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