Don't touch it with a barge pole!!!!
The most obvious giveaway is the bright green stitching (on edge trim) and the sharp edge on the perimeter of chinstrap side-posts. There are a lot of these being traded around the UK by dealers who seem to have somewhat less 'knowledge' or 'selective knowledge' than we do!
Think about it.........the felt helmets were introduced in 1914 partially due to extreeme shortages of leather due to the Royal Navy's blockage of shipping. Question; why waste leather, labour etc., on fitting a fancy edge trim? - In my collection I have six "fitzhelms" (felt body helmets) - five have no edge trims, although one (Saxon 103rd Reg.) has a brass front peak trim and vented rear spine - this being an early varient.
Hope this is of help, as one thing I can't stand is crooked dealers!!!
Regards,
Martin.