This, to say the least, is a very unusual helmet.
I have not see a blue cloth helmet of its shape or design in any of the British Army regiments.
It has a number of unusual features including a forward pitched dome, flat front peak and sloping rear. It has brass straps
from the central plume holder to front, back and sides. The front sports a Royal Artillery plate with a Victorian crown and the side chain holder with a grenade.
I have been onto the Artillery museum and they can only think it must have been a rejected design submitted for approval.
Any suggestions?