PAN X350 from 1964 2nd Printing Cover Design Raymond Hawkey		PAN X350 from 1965 4th Printing Cover Design Raymond Hawkey
The following information should help to shed some light on the very rare OHMSS first edition. It seems that there was huge demand for this book when it came out and as a consequence there were numerous print runs of the hardback as they clearly sold for more. The majority of the first Pan prints therefore went to Australia/Canada and will typically have 60c on the cover. The 2nd edition is also rare. It was the 3rd before the UK priced version appeared in quantity.