Two Shillings and Sixpence, or a Halfcrown, has been a part of the British currency for hundreds of years. I will assume that you mean a more recent year prior to the currency becoming redundant.
Two Shillings and Sixpence GBP in 1966 had the purchasing power of about £1.56 GBP today.
Two Shillings and Sixpence GBP in 1966 had the purchasing power of about €0.80 EUR today.
NOTE - This historical conversion is the result of many calculations and considerations by a purpose designed program for which I can take no credit. The resulting answer should only be regarded as an approximation.
Austria is on the Euro, 1 USD is worth about 80 Euro cents
As of today (01APR2011), 1 Euro is worth about 88 pence, or 0.88 pounds. One pound is worth about 1.13 Euro.
50 cents
As of today (01APR2011), $199 US Dollars is worth about 139.81 Euro.
As of today (01APR2011), 40 Euro is worth about $56.94 US Dollars.
Today, a euro is worth about $1.55.
As of my last update, the exchange rate for the euro to the Ugandan shilling fluctuates, but generally, 1 euro is worth approximately 4,000 to 4,500 Ugandan shillings. Therefore, a 20 cent euro, which is 0.20 euros, would be worth around 800 to 900 Ugandan shillings. For the most accurate and current exchange rate, it's best to check a reliable financial news source or currency converter.
As of today 43 Euro is worth about 54.61 US dollars.
Austria is on the Euro, 1 USD is worth about 80 Euro cents
The Austrian schilling was replaced by the euro in 2002, with the conversion rate set at 1 euro equal to 13.7603 Austrian shillings. Therefore, if you are looking to convert shillings to euros, you would divide the amount in schillings by 13.7603 to get the equivalent in euros.
As of today (01APR2011), 1 Euro is worth about 88 pence, or 0.88 pounds. One pound is worth about 1.13 Euro.
As of today (01APR2011), One Botswanan Pula is worth about 0.11 Euro. One Euro is worth about 9.29 BWP.
50 cents
As of today (01APR2011), $199 US Dollars is worth about 139.81 Euro.
As of today (01APR2011), 40 Euro is worth about $56.94 US Dollars.
As of today (02APR2011), 1 British Pound is worth about 1.324 Euro, and 1 Euro is worth about 0.8831 Pounds.
The value of a 1975 Kenyan one shilling coin featuring the first president of Kenya in mint condition is 1.50 Euro, or 179.01 shillings. In good condition, the coin is worth 0.10 Euro, or 11.93 shillings.