Manchester Sheffield & Lincoln Railway, Grimsby Docks Metropolitan Police Whistle complete with chain. A magnificent and very scarce item, beautifully engraved 'M.S.& L.Ry Grimsby Docks 7'. Also bears the makers name 'J. Hudson & Co 131 Barr Street, Birmingham. Research shows that only 20 policemen were employed by this company at Grimsby Docks and this is the only whistle of this nature to have survived. A unique opportunity for the whistle collector.