German 5,000,000 mark from inflation period

I have some old German marks and am unable to identify one. Would anyone recognize this and be able to advise of value? Every other one I have I was able to easily find through 2 or 3 websites. This one has a pink flower background, the back is blank except for the flowers. It is marked Handelskammer zu Caffel (I think, the script is hard to make out.)