The 1972 Eisenhower dollar has been identified to have three different variations (types) noted - Type 1, 2 and 3. 'FG''FG' is the designer's initials and appears on the front and back of all the Ike dollars except the bicentennial reverse design. The silver Ike dollars are worth about 4.50 plus a collectors premium, which makes it worth around $8.00. The silver ones that the mint made for collectors is worth around $4.44 as of June 15th, 2009, just for the silver in it. The value of a 1972 'Ike' dollar is worth around one-ten dollars, depending on its condition.
AnswerUnless it is a proof coin or high-grade uncirculated certified by one of the major grading services, it is worth a dollar but I have seen some well-worn ones priced as high as $3 at flea markets. If it's a special 40%-silver collector's coin in its original package, it would retail for about $4.50 using the price of silver as of 09/2008. If it's from circulation and made of copper-nickel, it's worth face value.