JeffTilley
Hi all, very late to this post, but felt I had to pitch in (forgive the pun!)
I have a set of irons from St Andrews Golf Co, yes 5 miles from the OLD COURSE!
George Nichol Precision Irons. 100% identical to ERG x3's.....
1025 Carbon forged and CNC milled fitted with KBS C-Taper 115 R+ Shafts.
Purchased 3 years ago, superb irons.
Great feel, ball flight....
So I would suggest open mould.
ERG claim they were involved in the design, highly unlikely.
I know the owner of St Andrews Golf Co, and THEY DESIGNED THEM, in conjunction with Dundee University?
So a bit fishy, as we would say in the UK!
But I will say they are exceptional irons and easily stand up against current OEM offerings.
Hope this helps shed some light on the matter....