Hello Fatgit,
The 1980 Hong Kong ten cent coin is quite common in circulated condition and is usually worth little if any premium.
An uncirculated coin's value depends very much on it's condition.
A 1980 ten cent coin graded MS63 by PCGS sold for $382.72 in July 2008. At the time PCGS had graded five in MS63 with six graded higher. As of today, PCGS has graded fifteen coins MS63 and twenty-four higher.