Never seen the middle bottle before. The cobalt one is a "KV-6", but technically isn't a poison. Contained Ergotole. It may have held other things, but the only labeled example I have seen had Ergotole in it.
Bump - found this at a spot where they are digging up part of the sea wall in Sea Point, Cape Town. Googled it and found this entry in A-B.net and thought I would add to the thread rather than start a new one.