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Anyone also knows about the "A" numbering for this stamps?
How do other catalogues number these stamps?
Among other things, the "A" suffix is often used to indicate a perforated stamp; "B" an imperforate stamp.
My 1990 Michel #3629-2525 does not show A or B and has no indication of the perforation.
1975 Minkus shows #1343-1350 as issued July 1972, and only imperforate. Hitler is #1347.
1976 Official Trucial States (printed by M. Carus in Italy) shoes #2396-2403 does not indicate perforation, Hitler #2400.
1986 Stanley Gibbons Middle East does not list Ajman beyond the early 1972 issues.