Boatswain's Call aka Boatsn pipe

Heya, all,

Just came across interesting post at Australian Metal Detecting forum- Whistle
And immediately realized that i have found one, but taken that as a crack Pipe! :/

You can find it in the video here On 01:15 of the video:

Here is more about an item :
http://ahoy.tk-jk.net/macslog/HistoryoftheBoatswainsCal.html

Very Interesting :-)