This “torture"cover artwork was used on several editions with slight changes and some editions have not yet been found. If you have a copy with this artwork please check if your copy fits with the below - if its different please get in touch.
12th edition 1963 has yellow band with X232 to spine. Note later Pan logo. All examples found have 3’6 printed to the cover.
13th edition 1963 has yellow band with X232 to spine. All examples found have 3’6 printed to the cover.
The 13th edition has also been found with the green Hawkey playing card cover.