Spike,
From the information I found I can tell you that in the Atlantic basin, the strongest hurricane to make landfall outside the USA was David in '79. It slammed into the Dominican Republic on Aug. 30th as Category 4 hurricane with a minimum pressure of 924mb. By the time the eye brushed Florida it had weakened to a 100mph Category 2. Here is the ranking for most intense landfall hurricanes outside of the USA:-

(rank is independent of other events in group)
4 David (S of PR) 1979 4 924 27.29
7 Unnamed (San Felipe PR) 1928 4 931 27.49
14 Hugo (USVI, PR) 1989 4 940 27.76
33 Iniki (Kaua'i HI) 1992 Unknown 950 27.91
43 Dot (Kaua'i HI) 1959 Unknown 955 28.11
50 Donna (St. Thomas, PR) 1960 4 958 28.29
64 Iwa (Kaua'i HI) 1982 Unknown 964 28.47
65 Georges (USVI, PR) 1998 3 968 28.59

As for the rest of the world I'm not entirely sure - it is quite difficult to find any information on this, especially since Unisys seem to have lost some of their storm data recently. Hope this helps.