answer to question "Whose portrait was used as the watermark on Irish banknotes" is LADY LAVERY
It is an unnamed portrait by the great German artist Albrecht Dürer.
Some countries date their banknotes, others do not. It is a matter of choice for the country concerned. The date of banknotes from those countries that do not print the date on them can usually be determined by a combination of the specific design features of the banknote, the serial number and whose signature appears on the banknote.
President George Washington
Benjamin Franklin
the portrait of GeorgeWashington
President Grant.
michangelo
Ulysses S. Grant.
The Nawab of Pataudi
The profile or portrait of the reigning monarch is on all regular issue stamps.
Cé leis tú?
It is not known. Heracleitus looks like Michelangelo.