I think Klaus Brunch at MBB may have other ideas .
I am not sure if the 105 or the Aerospat gazelle were the first although neither is all composite. I am certain that even the Carson Blade has the metallic cuff to atatch to the rotor head.
I think the claim is the first all composite blade for the S61 ( though not the Sea King as I think Westlands have retrofitted many). ( edited for spelling ).