Quote:
My research today has led me to believe that the actual years are in fact allocated by the 'regnal' "date/mint letter" that appears between the Toughra and the inscription on the Obverse.
My research today has led me to believe that the actual years are in fact allocated by the 'regnal' "date/mint letter" that appears between the Toughra and the inscription on the Obverse.
That is correct.
1327 in the Islamic calendar should be around 1909 in the Gregorian calendar, so to find the Gregorian date using the regnals years requires a little bit of math: date + regnal year - 1. The reason one has to be subtracted is because there is no regnal year of zero; 1909 has the year of one.
So, 1909 + 5 - 1 = 1913, meaning you are right with your first three.
1909 + 3 - 1 = 1911, meaning you are just off one year on that last one.
Looking at the Numista pages, it looks like the 40 para's Gregorian dates are off. The other three pages all look correct though.























