What is a Finnish markka coin?

Excuse me, could you possibly elaborate on the concept of a Finnish markka coin? I'm quite intrigued by the history and significance of this particular form of currency, especially in the context of Finland's economic landscape. Could you provide some insight into its design, circulation period, and perhaps even its value during its time in use? Additionally, are there any interesting facts or anecdotes surrounding the Finnish markka coin that you'd like to share? I'm eager to learn more about this fascinating aspect of Finnish monetary history.