is it on display anywhere?
Yes, the National Museum of Damascus.
Emesa helmet
Confiscated by Syrian police soon after looters discovered it amidst a complex of tombs in the modern-day city of Homs in 1936, eventually the helmet was restored thoroughly at the British Museum, and is now in the collection of the National Museum of Damascus. 
what is the emesa helmet? A Roman cavalry helmet can you please describe it? It consists of an iron head piece and face mask, the latter of which is covered in a sheet of silver and presents the individualised portrait of a face, likely its owner. when was it discovered? August 1936 what is its function? The Emesa helmet is highly functional, and was likely made for both parades and battle. where was it discovered? The modern-day city of Homs
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Emesa helmet [SEP] Introduction
The helmet was found in a tomb near a monument to a former ruler of Emesa and, considering the lavishness of the silver and gold design, likely belonged to a member of the elite. As it is modelled after those helmets used in Roman tournaments, even if unlikely to have ever been worn in one, it may have been given by a Roman official to a Syrian general or, more likely, manufactured in Syria after the Roman style. The acanthus scroll ornamentation seen on the neck guard recalls that used on Syrian temples, suggesting that the helmet may have been made in the luxury workshops of Antioch.