Here are some pictures that you can obtain of the Moulton bicycle being ridden in the 1960's.

Gary Miller and Gary Raymond riding home from Lyric Theatre, Shaftesbury Avenue London.

Gary Raymond appears to be riding a pre-production Moulton Safari and Gary Miller a Moulton Demonstrator.

Gary Raymond is an English actor and Gary Miller was a pop singer and actor. Gary Miller appeared in the 1964 production of She Loves Me at the Lyric Theatre. The pictures are from PA Photos and in various sizes as shown below unmounted or mounted.

Alex Moulton in front of The Hall with bicycles.
It would appear that the models are on the ground are Standard and Deluxe models, next up is the Moulton Midi and then on the top step is the 'S' Speed with chrome forks. The picture would probably date 1967.
There are two sizes for the photographs available below.

Moulton Marathon
Colin Martin rode the specially designed Moulton Marathon in 1970 from England to Australia and his story is told in the book Half Way Round.
Colin completed the other half, across the USA, in the 2002 but this time riding another green bicycle, a New Series Moulton. Only one of the Moulton Marathons is known to be in existence although there may be a another one around yet to be discovered. It is understood that there were three or four made? Colin had two Marathons, one of which was stolen.
Artwork of the Marathon is available for a T shirt or as stickers that er available from www.redbubble.com and enter in search box Moulton Marathon

The image below is from a sticker.