Thanks Emmanuel. I look forward to seeing your pics.
Two more biconcave yelmans. One on Ariel's ancient shashka (which I can't believe I forgot about), and another on a very high-class tulwar.
Full pic's of Ariel's sword can be seen here:
http://www.vikingsword.com/vb/showthread.php?t=2695
Hmm, I can't help but think that there's something connecting all these different sword types, some sort of missing link.........