Hello Blair, These are called Fish vases, axehead is a serious misnomer!
This is of a later date than Michael Harris, I would think after Joseph Said took over. Pink did not come in until the '80's.
Haven't you managed to get hold of Mark Hill's book "Michael Harris: Mdina Glass & Isle of Wight studio Glass" yet? You do seem to have an interest in this glass,
, demonstrating your excellent good taste! The book is fantastic.