Israel Coin, What Year?

The date is actually the Hebrew letters "Hay Taf Shin (apostrophe) Nun."

Hay= 5 (thousand), Taf=400, Shin=300 (400+300=700), Nun=50. This is how the year in the Jewish calendar is written. This is 5750, corresponding to 1990. The Hebrew year begins in the Hebrew month of Tishrei which usually begins in September, although since the Jewish calendar is a lunar calendar can also be in October.

Frequently, when writing Hebrew, the year is abbreviated to the last 4 Hebrew letters, i.e., the last 3 English digits, when discussing the current millennium.

That is to say, that the 1st letter Hay, corresponding to 5 (thousand) is not commonly written (except on certain documents, currency, etc.). For instance, this current year (5768) is called Taf Shin Samech Ches, which literally means (Taf=400, Shin=300 (400+300=700), Samech=60, Ches=8) 768. The 5 (thousand, the 5th millennium) is self-understood.

However, when writing in English, the whole year is always written out fully, i.e., 5768.

BTW, the year in the Jewish calendar dates back to Adam & Eve, i.e., the creation of Mankind, or alternatively to the Creation of the Universe, being Year 1, calculated by the genealogies going back to Adam & Eve, as recorded in the Jewish scriptures. There is some discussion whether the "Six Days of Creation" were six actual days of 24 hours (the more commonly held view), or represented six millennia or Epochs.

To convert the Jewish (Hebrew Calendar) date to a Common Era date: The Jewish calendar dates back to when the world was created in 3760 before the Common Era, so to convert Jewish dates to Common Era dates, simply subtract 3760. Hence, 5750-3760 = 1990.