This 10-pin crossarm design and arrangement was very common here in New England as I fondly recall where I grew up near Boston, MA. 10-pins were the rule with 30-inch crossarm braces placed *over* their well and heavily creosoted arms that were designed to last forever. These residential phone service lines carried mostly common glass and the wire were galvanized steel, almost always in pretty good, lightly weathered condition. New England Telephone was in the process of getting rid of their openwire here in the Boston area in the 1960s. A few short runs consisting of sidepins stuck around well into the 70s. It is known that a 10-pin, double-crossarm NET&T Co. subscriber line stretched in Plymouth, MA near or in Myles Standish State Park until 1979. All NET&T Co. crossarms had a pole tag nailed upon them mid-way between their center bolt and crossarm end which identified that these without any doubt were Ma Bell's telephone wires.