Because of this forum, I've begun to collect foreign coins. Many times I come across a date of 1232 AH, or 1255 AH, etc.......that's it, nothing more. What yr is a coin with only an 'AH' number? Sometimes there is a double date, i.e., 1235 AH -1816. Well, over time I figured that if one adds 581 yrs to the AH number, you get the true date in our dating system. So, Saor Alba's Zanzibar's 1 pesa coin is dated 1880. I believe I'm correct on the dating of these various coins, but then........