WYPO Vintage Automotive Brass holder Marker Timing or Tire

Description

WYPO Marker - vintage
Not sure of use, believe it maybe a marker for timing a car or marker to mark bad spots on tire.
Or it could totally be something else, it is old.
5 1/2" long, metal pen shaped with shirt clip.
Inside has a soft but chalk-like marking material.
Screw - Top lock in marking material.
Please email questions before bidding, thanks