Ron,
Not necessarily wrong: as only the early M15 pattern fluted spikes for Bavarian Kavallerie/Artillerie had the pearlring.
Bayerisches A.K.O. of 31 March 1916 - (a copy of the Prussian A.K.O. of 21 September 1915): this Military Kabinetts Order of the Bavarian King orders the replacement of this type of spike by the ball-the Kugel.
I just mailed you some photo's (PM)...copyrights you know...
This spike is a bit rusty...-But I wouldn't mind if I needed one.
Regards,
Francis