I have this bayonet with regimental markings 30.L.I.1.223 (as far as I can tell) and think this to be 30th Landwehr Infanterie 1st Company weapon nr. 223 ?
It has a date for taken into property of 1876 and would be interested to find out where the unit were located at this time and what they were doing. It makes such a difference to have history behind these items.
Steve.