3rd-4th century AD. An iridescent globular glass flask with vertical rows of pinched protrusions. See Christie’s London, Alfred Wolkenberg Collection of Ancient Glass, London, 1991, n. 42 for a related specimen of this flask. 27.3 grams, 59mm (2 1/4"). From an important central London collection formed since the mid 1960s; thence by descent. The glass vases with small knobs were a very popular type of vessel in this period, the sprinkler flasks of such typology being characterised by a very small opening designed to dispense small amounts of liquid virtually drop by drop via the constriction ring in its neck.