I've added pics on post #9 of the makers mark I'm used
to seeing on L. G. Balfour wings. Yours could have
been made from original dies, so there would
be no difference in size.
It's entirely possible that they are repros or 'restrikes'
- there's plenty out there. It depends on how badly
someone wanted them, and what the price was.
Flight Engineer and Liason wings are not that
common and usually expensive.
What do the clutch pins look like.........?