Poster for a legalise marijuana rally in Hyde Park – one of seven sold together for £4500 at Bellmans.

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His drawings, mainly in pen and ink and enlivened by brilliant washes of colour, were reproduced in the leading counter-culture publications of the day.

Pictured here is perhaps his best-known work that was used as a poster to promote the second public rally for the legalisation of marijuana in London’s Hyde Park on July 7, 1968. The designer was Martin Sharp, co-founder of Oz magazine, which included it as a pull-out in its June 1968 edition.

The Show Your Head poster was printed in different colour variations: offered for sale as a single lot at Bellmans (22% buyer’s premium) in West Sussex on June 17 were seven copies, five with purple and two with orange text.

In the past decade, these have become highly desirable. Estimated at a tempting £80-120, bidding reached £4500, when they sold via