I assume you mean it has no mint MARK. All coins "have a mint" in the sense that they're all made in mints.
Remember, the P mint mark didn't appear on Philadelphia dimes struck before 1980 so your 1972 dime is perfectly normal. That means it's only worth a dime. You should be able to find others in your pocket change from time to time.
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The value of the Morgan 1885 half dime varies based on its condition. This coin in mint condition is valued at over 2,200.00 as of 2014.
Please post a new question with its date and mint mark.
The 1937 Winged Head or "Mercury" dime is worth about $0.99-$2.50 However, proof or mint state coins can be worth $40+++
The value of the more common dates among Roosevelt dimes is based on their silver content rather than their mint mark(*) Regardless of mint mark, a 1959 dime is worth about 0.072 times the current price of silver which can be found in the business section of a newspaper or at a site such as kitco.com/ (*) See the related question for info about mint marks
You need to know its condition and mint mark. Check a site such as the one below for a range of values.