Force History: Established 2 April 1836. 1 April 1974 Became part of West Yorkshire Metropolitan Police
The Kings Crown was worn from 1902 until 1953, thereafter badges bear the Queens Crown.
Police History of England & Wales by Peter Clarke (2021 ed), ISBN 978-0-9858978-5-7
https://british-police-history.uk/cgi-bin/index.cgi
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