OK, here is what is probably the last-produced mold type of typical Hemingray-made beehive with the lettering "H.G.CO." on the side and "H" on the dome. The lettering is the typical "Stamp" style lettering, more familiar on other insulators, such as on all of the CD 152 "Hemingray / No 40". The lettering is small, standard sized, sometimes erratically spaced, typically 6 mm in height. Each individual letter was hand-stamped into the mold. These don't seem to be as common as the earlier prism-style insulators, at least in my area, but no doubt some areas (such as on railroad lines out west) had a plethora of them.