I ordered it direct from Nakaya in 2009, when they were all the rage on Fountain Pen Network. I think mine is the second one they made in the stone finish. The dorsal fin does not actually work very well to stop it rolling but I think they have since made...
I mean the combo strap - watch and the combo watch - pen If I don’t mistake I have the very same one (unfortunately only the pen, not the watch 😉🤷🏻♂️), I’ll check tomorrow…