Found November 1915, Hornsea, East Yorkshire.
On a thin piece of wood, written in indelible pencil:
S.S. Membland torpedoed, engine-room port side. Good-bye, dear.
The steamship Membland was lost while sailing from Hull to Newcastle upon Tyne, with 22 men, two women and a child. It was last seen off the Spurn Lighthouse, at the mouth of the Humber, on 15 February 1915. Wilfrid Wright, a carman, found the message on the shore, and passed it to the coastguard. No enemy ships had been sighted in the area, but several vessels had been damaged by mines, and the coastguard believed the message was genuine.
[Dundee Evening Telegraph, 25 November 1915]