Christies Late Roman helmet: 1 or 2?

[Nathan Ross]

the quality of the patina of rust ... it's so homogeneous .... an analysis of the quality of the iron would tell us something more about the origins of the piece(s) ... the mineralogical composition of the Roman iron was pretty different from the modern iron.

Looks to me as if both helmets have been painted with something, perhaps (if they're genuine) to cover up some major restorations? So the patina might not be too visible. But a proper scientific analysis of the metal would be the only way to determine what we're really looking at here.