Hello,
For this coin
Egypt 1 Pound (New Branch of Suez Canal)
https://en.numista.com/catalogue/pieces75818.html
The comments section says: "1. En error year " 2011 - 1432" found in circulation. We willnot add it to the year list to avoid misunderstandings"
However, I believe this year line should be added! As it appears the coin was initially issued with the 2011 date, and later on that stopped, and it was issued with the correct 2015 date. And it seems to me it's not just a few error coins, as rolls exist.
Here is a picture of a bank roll of the 2011 coin:
https://www.instagram.com/p/BRIsHh6gk0o/?taken-by=currency_q8
Thanks