Ca. 400-500 AD A miniature late Roman flask made of light green glass with a tubular everted rim, cylindrical neck with constriction above tapering body which rests on a quadrangular base. Over time, accretions formed over the surface, which, in places displays a beautiful iridescence.For a similar unguentarium, see the purple unguentarium in this collection sold at Bonham?s:https://www.bonhams.com/auctions/13151/lot/97/.To read further about Roman glass, see:Bayley, J., Freestone, I., & Jackson, C. (2015). Glass of the Roman World. Oxford And Philadelphia: Oxbow Books. Size: L:88mm / W:24mm; 21.6g Provenance: Private UK collection; From an old London collection formed in the 1990s.