[Rainbow Demon]

I ran across an article on these many years ago, but have heard nothing more about them since then.
These were a very limited production pistol meant for elite services in England, the Tranter name chosen because of its historical connections.

These would cost a mint to make these days. The barrels for example were made by a company that made precision surgical instruments.

I expect that of the few made most if not all are still in possession of those who'd carried them on duty whether retired or still active.