I have, somewhere and a looong time ago seen an axe like this. That said, it could well be an ARP axe, rather than an RAF axe.
The RAF axe wasn't really as effective as it was promoted as being.......we decided to chop a few holes, officially I should add, in a couple of Canberra's one day using one. Imagine one of those cartoons where the vibrations go up and down the arm of a character...yep, one full on bash, well done Al ! .....and lots of "boings " thereafter. Canberra remained intact.