Hi Willem,
Many thanks for the info re the bayonet. The 15 below the crowned L would suggest, as you rightly say, Ludwig III of Bavaria (1913-1918) with a date of 1915 for the bayonet itself. The enigma is the crowned K which appears below the crowned L suggesting Karl of Wurttemberg (1864-1891) on a 1898/05 bayonet !!!! Any ideas gratefully accepted
My Regards,
Norman.