Thanks go to Mary Ann Pike for discovering this photo from a recent eBay sale. Note the gutter top in the back of the car. A caption reads:
"ASHLAND SISTERS, Mary Lou Carlson (standing) and Joan Keeney spend their free time scouring hills of Southern Oregon for old telephone line insulators. Three insulators are shown with their shovels and other equipment."
The photo dates from 1969. I purchased insulators from one of these two ladies about 15 years ago, along with a couple of other members of the Jefferson State Insulator Club. It was fun to find this old photo!