There were no 1990 British Two Pound coins minted.
Britain never issued a 10 Shilling coin, and if they had, they would have stopped minting them prior to the changeover to decimal currency in 1971.
Such a coin does not exist. The British Shilling was last minted for general circulation in 1966. The British Shilling was withdrawn and demonetised in 1990 along with the larger (23.5mm) 5 Pence coins it replaced.
The approximate value of your coin according to Numismatic News Coin Market Monthly Price Guide for March 2007: 1990 Silver Eagle = $18.00
Britain changed from the Shilling in 1968, prior to their full conversion to decimal currency in 1971, although the Shilling coin remained in circulation until 1990. The British Shilling converted to 5 New Pence. Other British Commonwealth countries changed from their respective Pounds, Shillings and Pence currencies to their own decimal currencies at different times during the 1960's and 1970's. Three African countries Kenya, Uganda and Zambia,all former parts of the British Empire, still have the shilling as their currency.
Elana Shilling was born on June 15, 1990, in Thornhill, Ontario, Canada.
You need to provide the year. Without knowing the year it is impossible to value your coin. Crowns (5 shilling) pieces were minted in several different years and have vastly different values depending on what year they were minted in.
None. The Shilling is part of the obsolete British predecimal currency. There were 12 predecimal Pennies in a Shilling and 20 Shillings in a predecimal Pound. The British Shilling converted to 5 New Pence at the conversion to decimal currency and circulated side by side with the same sized 5 (New) Pence coin until 1990. The One Pound coin was first issued in 1983. No new Shillings were minted after 1966 and the Shilling was finally withdrawn from circulation in 1990.
Fair market value as of 12/2008 is $9.
As of 31Dec90 GBP1 was worth USD1.9350 starting 1990 on 01Jan90 at 1.6060.
If you mean a 1990 Silver Eagle only Proof and bullion coins were struck in that year. From 1986 to 1992, proof Silver Eagle coins were minted at San Francisco and these coins bear the "S" mintmark and have a current retail value of $20.00. Bullion Silver Eagle coins dated 1990 were also struck at San Francisco but do not have mintmarks, the value of these coins depends on the spot price of silver at time of sale. As of today it's about $17.50.
Such a coin does not exist. The British Halfcrown was last minted for circulation in 1967 and was withdrawn and demonetised in 1970.
This is a bullion coin sold for its silver value, currently about $17/oz. The "$1" denomination is artificial.
The last silver certificates were printed with the date 1957, and no US $1 bills are dated 1990. Please check again and post a new, separate question.