It may be worth about .10 with heavy wear to around .25 if uncirculated (no wear). You might also try a library for a copy of the Standard Catalog of World Coins for pictures, values and lots more interesting info.
Her majesty Queen Elizabeth II
They were both important members of the British government at the same time. Major was the prime minister from 1990 to 1997 and Queen Elizabeth was monarch at that time.
Dame Commander of the British Empire in 1999.
Please check your coin again and post a new, separate question with its country of origin. None of the Commonwealth countries that issue 5 cent coins strikes them in silver for general circulation.
Elizabeth Harwood died in 1990.
Elizabeth Center was created in 1990.
Elizabeth Warden was created in 1990.
Elizabeth Debicki was born in 1990-08.
The Reluctant Queen was created in 1990.
the blood queen died 1990
Elizabeth Milne was born on 1990-12-11.
Elizabeth Parke Firestone died in 1990.