Transparent light yellowish green. Mold-blown; parison blown in ribbed dip mold, withdrawn, and twirled. Beaker or lamp: conical. Rim outsplayed, with rounded lip; wall tapers, descending at steeper angle for top one-third than bottom two-thirds; base plain; pontil mark circular (D. 1.3 cm), with speck of scale. Wall decorated with closely spaced shallow ribs, which spiral down from left to right; they are faint immediately below rim and they disappear 3.5 cm from base. Glass contains small bubbles, with few larger, elongated bubbles at rim.