(1/2: Intro) Westinghouse 400W Mercury Vapor Coated Cleartopper Bulb.

This amazing bulb that I just found today in a antique market it's awesome! Made by Westinghouse in the US around 70s or 80s, whit a lot of hours in the arc tube but still unique and beautiful.
This is a pure Westinghouse cleartopper Mercury Vapor 400W bulb, with the /W model, that according to some research I made and some guys at Lighting Gallery, its a very hard item to find, this is not made by the Philips/ Westinghouse division, this is only old good Westinghouse.
I don't know if it still works but I will find out later!
Wanna know if it still works? Watch the test video! • (2/2: Testing) Westing...

[@andycflbulb]

Nice find! Especially a /W one! I watched the startup vid first, pretty cool!

[@THEBULBHOME]

Thanks! Im really happy with this bulb but just for the record... What does the /W means or why it makes the bulb so special? :)