I suspect this location was near the coastline of Maine.
The pole line construction as seen was very typical through the 1960s all over Maine. Central Maine Power often used 6 foot (4-pin) and 8 foot (6-pin) crossarms for their 4kv stretches. New England Telephone employed ten-pin crossarms like you see, everywhere within their service territory for subscriber leads. Their arms were heavily-creosoted pine with wooden pins, designed to last forever. They used 30-inch crossarm braces with the brace mounted on the *outside* of the arm. Halfway between the arm's center mounting bolt and crossarm-end was a NET&T Co. pole tag affixed with two aluminum nails.