The script looks Persian to me. If this is so the date could be according to the the Jalali calendar, which is solar based, and the only real difference is it starts, as does the Islamic calendar, at the flight to Medina. Thus +621 years would give a date of 1947.
The Jalali calendar was devised by, amongst others, our old friend Omar Khayyam, to overcome the problem of the Islamic calendar losing step withe the seasons.
Regards
Richard
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