It doesn't have to be old to be valuable.
DOLLAR COINS/BILLS
THE EISENHOWER DOLLAR, SOMETIMES CALLED THE IKE DOLLAR, STARTED IN 1971 AND STOPPED IN 1978. COLLECTOR COINS WERE PRODUCED ON 40% SILVER PLANCHETS AND BUSINESS STRIKES WERE MADE FROM COPPER NICKEL. A 1977 BUSINESS STRIKE WAS FOUND ON A SILVER PLANCHET AND IS HIGHLY COLLECTABLE AND RARE!
IN 1979 THE SUSAN B ANTHONY (SBA) DOLLAR WAS PRODUCED UNTIL 1981. IT WAS STRUCK FOR ONLY ONE MORE YEAR, 1999. KEEP AN EYE OUT FOR SBA'S STRUCK ON QUARTER PLANCHETS!
IN 2000, THE SACAGAWEA DOLLARS WERE PRODUCED. ALTHOUGH THEY LOOK GOLD, THERE IS NO GOLD IN THE COINS. 
STARTING IN 2007, THE PRESIDENTIAL DOLLARS WERE PRODUCED WITH THE SAME GOLD COLOR.(ALSO NO GOLD IN THESE COINS)
 
ABOVE IS THE NORMAL REVERSE. LOOK AT THE DESIGN ON THE EARTH AND COMPARE IT TO THE RARE REVERSE IN THE PICTURES BELOW.

1972 PROOF REVERSE HUB
APPROX. VALUE $20-$150
DIFFICULT TO FIND
RECOMMEND 12X OR HIGHER

1972-D DOUBLED DIE REVERSE
APPROX. VALUE $20-$100
VERY HARD TO FIND
RECOMMEND 12X OR HIGHER

ABOVE IS THE WIDE RIM, OR NEAR DATE. COMPARE THE DISTANCE OF THE DATE TO RIM TO THE NORMAL SBA BELOW.
 
1979-P WIDE RIM
APPROX. VALUE $5-$35
VERY HARD TO FIND
RECOMMEND 5X OR HIGHER

ALTHOUGH THE WEB NOTES ARE WORTH JUST A LITTLE MORE THAN FACE VALUE, THEY HAVE THE POTENTIAL TO INCREASE GREATLY IN VALUE.
WEB NOTES GENERALLY RANGE FROM $2-$20 AND WERE PRINTED IN 1988, 1993, AND 1995. ANY WEB NOTE WITH A "STAR" IS HIGHLY COLLECTABLE! THE 1988-A (F) FROM ATLANTA IS WORTH OVER $400!  

  
THE TOP BILL IS PRINTED AT THE FORTH
WORTH FACILITY AND IT HAS FW ON THE
FRONT AND LARGE NUMBERS ON THE REVERSE BELOW "E" IN ONE. MOST $1 BILLS WILL HAVE FW, OR NOT, BUT OCCASIONALLY YOU WILL SEE A "STAR" NEXT TO THE SERIAL NUMBER. IN MOST CASES, THEY ARE NOT VALUABLE, BUT I ALWAYS LOOK IN THE "GUIDE BOOK of UNITED STATES PAPER MONEY", BY WHITMAN PUBLISHING, FOR THE RARE/VALUABLE ONES.
THE WEB NOTE IS VERY EASY TO REMEMBER HOW TO FIND. IF YOU ALWAYS LOOK AT THE FRONT OF $1 BILLS, JUST LOOK FOR THE MISSING LETTER AND NUMBER NEXT TO THE NUMBER ON THE TOP LEFT. I FIND IT EASIER, AND FASTER, TO LOOK AT THE BACK OF THE BILLS FOR THE NUMBER ABOVE THE "E" IN ONE.
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