It is very rare that the artwork used on the covers of various Saint books is used twice, especially from country to country. The 1955 Swedish edition of Helgonet vid Spanska Sjön (The Saint on The Spanish Main) uses the exact same artwork as the 1955 American first edition of the same title by The Crime Club. Both editions feature cover artwork by Richard M. Powers.
You can tell that The Crime Club edition was first as there are still remnants of their clever Crime Club man (see if you can find the letters C.R.I.M.E. within) swimming in the ocean on the Swedish edition.
If you know of any other such double-use of cover artwork, please comment below.