HI Ray,
I know a few makers of historical stuff, some a lot more expensive than others. Tod makes some wonderful stuff http://www.todsstuff.co.uk/knives-military/rondel-daggers-military-knives.htm but may be more than your customer wants to pay.
Owen Bush, who replied to you on BB is a top notch maker too.
A little more basic would be Rod Matless of interknife, http://www.interknife.co.uk/
Pauls Binns is another maker of reenactment weapons.