Antique Flute , Ivory head

Nice "Nach Mayer" 12 keyed flute in original case. Playing well. Used for irish trad sessions. A = 440 Hz with slide extended 8mm. Material (my best appraisal) : Head is either Ivory or bone, Barrel is ebonite and body is ebonised blackwood, keys German silver with standard metal slide. No cracks or crack repairs, some scuffs and marks which reflect its age. Early 20th century, marked LP and D , (see pictures) Possibly made in USA where Ivory heads were more popular. The case is in good condition but no lock key. Questions or comments welcome. I can post worldwide or callers are welcome to come and play the flute. I can send a sound sample on request. Not ideal for a beginner , more suited to an experienced player.