is this an oddity or rarity! weird thing to say the least. certainly! but is a ww1 bayonet.... Lovely WW1 & WW2 Trench Signalling lamp with Bayonet Fixing | Equipment and Field Gear | World War Wonders
Signal lamp from WWI designed to fit on a 1907 Bayonet. This allowed it to stick up above the trench parapet and the morse key for the lamp kept protected below the rampart courtesy 'N source old smithy-info site below..