Savings Bonds Certificate

Question: looking for information on a 1939 series postal savings system certificate number 8454. i think its a bond.?
IT IS FROM ST. PETERSBURG, FL(22ND ST. STATION) it is a one dollar. issued date june 10,1954. date when interest begins-july 1,1954. it is a certificate of deposit. please help me find its value or information on it. it was left to me by my great great uncle.
Answer: You can try checking at the unclaimed postal savings site.
http://www.unclaimedassets.com/US13.htm
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