I agree, Coat of Arms is frequently presented on the coins…
What is more, I guess it could be worth to have flag, coat of arms, small map and 5-6 phrase of country description (geographical & historical info), no more to don't writenthe long text. Plus special section for coinage history (also short to not create too much text here).
If I correctly remeber, there was some country description in the history but it was closed.