Very rare ML Lister magneto Type PLR for Humber Ltd. Bentley BR1, BR2 rotary engine
World War I 
Magneto stamped with military broad arrow 
Clockwise when you looking from drive end. 
Used unrestored condition. Very complete and original condition The magneto probably never been opened since was made over 100 years ago 
Very good sparks even on low RPM
All threads are good 
Internally not checked 
Untested on engine
I’m selling this for parts of renovation only