Acquisition is one of the most valuable modern prints ever donated to the museum

An American flag artwork worth at least $1m (£770,000) and made by one of the world’s most celebrated living artists has been donated to the British Museum.

With just days to go before the US presidential election, the museum announced that an edition of Jasper Johns’s Flags I (1973) had been gifted to them by New York-based collectors Johanna and Leslie Garfield.