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 currently uses the Euro which, .9 Euro = 1 USD (or USD=1 Euro) Previously Austria used a Shilling(ATS), 1 ATS = .081 USD or 12.42 Shillings per USD.
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 today 43 Euro is worth about 54.61 US dollars.
Austria currently uses the Euro which, .9 Euro = 1 USD (or USD=1 Euro) Previously Austria used a Shilling(ATS), 1 ATS = .081 USD or 12.42 Shillings per USD.
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.
3666.33 EUR
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.