The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
The Glenorchy City Council's centenary history and Wikipedia's[2] article on the factory both give October 21, 1921 as its official opening date.
Wikipedia's article on the factory corroborates the 1921 opening and 1922 production start, with Cadbury's first overseas expansion context.
The local council's centenary retrospective states the Claremont factory officially opened on 21 October 1921.[1]
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