This is probably not a genuine organisation - it's based on the grouping of a number of slides sets in the Riley 1905 catalogue using their code letters 'ZY'.
However a number of the 'ZY' sets are by identified makers such as W. Butcher (their Primus 'Peter Pan' sets (Riley 1913 supplement, set 1839), Rider (A study in black and white, Mischievous boys and the pea shooter) and Newton (Riley 1332, 1333) - so it's likely that the 'ZY' letters indicate 'miscellaneous', 'maker unknown', 'maker forgotten' or something else.
Record created by Richard Crangle. Last updated 24 March 2017
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