There is one 5 DM coin that is not a special issue, the one from 1971 with the big eagle on one side. That was the regular 5 DM circulating coin, 5 DM bills were quite rare at that time. So there were billions of those made. Most of them got handed in and changed for Euros, of course, and then got destroyed.
The 10 DM coins were special issues on certain occasions, like the Olympics 1972. To collect all of them is quite a task - there are a lot of them, and a few are pretty expensive among collectors.