Very typical Ma Bell construction here in the Northeast. Here in MA there were lots of one and two crossarm, 10-pin subscriber lines like this one extending down residential streets here in SE Massachusetts where I grew up in the 1960s. By the end of that decade most of these lines were replaced by covered paired-cable. Well at least I was welcome to pick through the pile of insulators behind New England Telephone's building in my home town. That was during 1965-1966. The metal was sold for scrap; the creosoted crossarms that were designed to last forever were kept by employees for use around their homes and lastly the insulators that nobody cared about were piled up for me to gladly pick through before they headed to the city dump (I never found anything too exciting...)