I really like this style of vintage chain link fence sign. This one happens to be local to Southern California and an advertisement for the company that installed the fence.
Other signs of this type are of course the ever Popular “Posted: No Trespassing” and sometimes the Produce company that owned a grove would Post one of their signs on a fence too. Security signs made it to the fence line as well “Private Patrol” and local Police Parking and tow away signs were often seen, some were Painted while others were Porcelain.
More of the letter”P” can be viewed at : http://abcwednesday-mrsnesbitt.blogspot.com/