445/659: Police Patrol
I'm not sure if these actually had faces. Most of my faces have worn of anyways (unless they never had faces), so finding a blank one shouldn't be a problem.
Set number is 445 or 659.
The POLICE print on the side of the vehicle is indented, so it seems to have been quite protected from wear.
I have the 'Spirit of St. Louis' brick too, but have never built the set it belongs to.