Such was the case for decades. The company hardly ever used small distribution insulators in porcelain. In fact after the company was purchased by Nstar in the 1990s (and later, to Eversource) it has been fairly common practice to continue transferring glass pintypes to new poles...to this day! Most of the glass that you see on these Boston area lines are double petticoat, side-tie styles; predominantly CD 164s, 165s, 165.1s and CD 167s. Typically these are Brookfields, Armstrongs, Stars, Gayners, Lynchburgs (smooth base only) and No-Name CD 38-20s in the designs and colors the forementioned are typically found in by collectors. Nothing rare.

Boston Edison pretty much ended their glass insulator "standard" for new orders by the mid-1960s. Subsequently, the company began purchasing porcelain pintypes. These were light gray and the majority are saddle groove types. Today you can sometimes see them mixed in with the forementioned glass variations, especially on 4kv distribution lines.