I am not sure if you have this information but, it is quite interesting: http://whistlemuseum.com/2008/10/22/round-pig-nose--fancy-top-by-s-auld-glasgow-maker-late-victorian.aspx
The Replica Whistles is appears were reproduced in the 1970's when a reoccurrence of interest in the Titanic came to be from the ship being explored. The Whistles along with other memorabilia from the Titanic started being sold during that time. They are actually still making them today, you can find them on sell. There is a place in Branson Missouri USA, that has the replica Titanic there, and you can buy all sorts of memorabilia there.
There are others for sell on Ebay : http://www.ebay.com/itm/Vintage-Titanic-White-Star-Line-Silver-metal-Officers-Whistle-SAuld-of-Glasgow-/261253504324?pt=UK_Collectables_Nautical&hash=item3cd3ec1d44
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