David, your page looks great and I'm so glad you created it for us naval enthusiasts to use as a source for research. Good luck with the Russian Imperial naval pieces.
So what about the Indian sub-continent!
I assume they used British pattern axes...or did they have them at all? Have you seen that Indian combination blunderbus/ax in 'Weaponry: An Illustrated History" by Chuck Wills, pg.165? I suspect this is a boarding piece. The book isn't very good, with some mislabeling, etc, but there were a few interesting pics, the ax being one of them.