My dad gave me these old coins which he got from his grandmother years ago. I'm not sure what they're worth but I hope they are valuable... Here's the information about them: (from top left to top right) 1920 Straits Settlement Half Dollar, same, same, same. (from bottom left to bottom right) 1939 Straits Settlement 20 Cents, 1926 Straits Settlement 5 Cents, 1945 Straits Settlement 1 Cent.
As for the condition, you can look at the (somewhat large) images attached to the initial post. Unfortunately I cannot comment about the possible value, as I do not know much about Straits Settlements coinage ... Christian