Now for comparison, here are some photos of an unmarked clear glass chamber stick with the same basic shape and the same size as the pattern no. 354 chamber stick shown in the opening post. The finger loop still has the same 'coral branch' decoration (so I presume, perhaps incorrectly, that this is still a Davidson piece).
The exterior of the base is, however, decorated with a 'Greek key and daisy button' design which is strikingly similar to that on Davidson's "Daisy" suite of 1886. In addition the flattened inside top rim of the candle holder cup has concentric rings, whereas that on the no. 354 purple marbled chamber stick is plain.
(Permission for the re-use of these images on the GMB granted by bargainman48).
Page 108 of Chris and Val Stewart's 'Davidson Glass - a history' reproduces Davidson's advert for the "Daisy" suite which appeared in the Supplement to the Pottery Gazette in December 1886 but there is no mention of a chamber stick in the pattern.
Does anyone have photos of Davidon pattern no. 354 chamber sticks in other colours, or with other decorative designs to the exterior of the base, please?
Fred.