There's many of these in Natrona Heights PA.

OV-12's are very cool and odd...i like how the two Sections aren't Hinged but Screwed together!...and the refractor opens up like a clamshell...if i had one it would be remote ballasted.

MO-8s are odd too and came same time as the OV-12s....the MO-8s opens from the top....it kinda folds open.....

if im Right...i do Believe Westinghouse made a MO-10 which is a Slightly Larger Version of the MO-8 do you know if the MO-10 Folds Open too?.....by Folds open you you mean the Fixture is mounted solidly to the Bottom and the top housing is what opens?

MO-10 isn't a larger version of MO-8....its actually same size but different style...the MO-10 looks more like (...) this one...except in more of a Silverliner shape...and the ballast access is on the top...so you just remove the cover on top......like the OV-12

ah thanks.

Does "OV" mean "ovate" as in prismatic glass lenses? What does "MO" mean?

it means OVAL....I am still trying to figure out the MO.....Joe would probably know....I have only seen MO-8s in use under my electrical company and New York City.......never seen them in other places...

Oval??? That's sort of unexpected...... I'll email Joe later this evening....

the refractor is Oval...that's why....before the OV-20 refractor is oval, the OV-10 refractor is oval, the OV-15 refractor is oval, the OV-25 is oval...even OV-25 remote ballast is oval...but the Westinghouse AK-10 AK-14 AK-6 Gumball/Teardrops does not have oval refractor....but more acorn shaped and round.....

There is one fixture called the Westinghouse OV-18 which is actually an incandescent and it is in an oval shaped fixture! It looks sorta like a sink mounted upsidedown LOL! Joe may have one....

A wild guess what the MO means is "Mercury Open-Bottom" That's what I think it means.....

That's exactly what Joe told me. He doesn't know for sure. He said he's more of a GE guy.......