CD 196 H.G. Co. No. 51 insulators in deep aqua and large lettering were found in the city's fire alarm supply room back in 1969 (by me) and perhaps those are what the blurry, large dark colored insulators on top are?

Click "Previous" for an overall view of this pole and the fire station it stood in front of (the station is still there and is active).

Quincy is a Boston suburb, boarding to the south.