I thimk i need the collective wisdom of all you chaps on this one.
hear is what i know.
it was found by a late freind of mine in france near the somme.
made of brass & and british the broad arrow is the only marking.
Its 10cm long and 4cm wide and if you blow through it hard it makes a wine like a siren this is done by a rotating wheel with notches in.
it also has three strips cut in it at so to hold it on a pipe fitting.
All i don't know is what it is fitted on whas it a air raid/gas siren or whistle from a train?
Any ideas are welcome