I've just seen a cruise helmet while checking UK ebay and thought I might bid on it although even though in some cases the seller doesn't describe his wares for what they really are.
The helmet is original, looks repainted but having never seen the attachment under the brim I had a quick check online and found a couple of variations including this one which is bloody good MKII Cruise Visor:
Do you think this one is original? ORIGINAL BRITISH WW1 BRODIE CRUISE STEEL HELMET
The same seller sold a similar one last month.