1942 Sylvania 4W T5 Black light blue 
Here is my 1942 Sylvania F4T5/BLB its the oldest tube in my collection and its the oldest BLB I have seen its NOS I lit it once its VERY dim but it does have some UV-A output (the etch is a bitch to take a picture of since it wraps around the tube and is quite faint) I got this awesome lamp from Jeremy (funkylamp) in a trade a few years ago

1942 Sylvania 4W T5 Black light blue

Here is my 1942 Sylvania F4T5/BLB its the oldest tube in my collection and its the oldest BLB I have seen its NOS I lit it once its VERY dim but it does have some UV-A output (the etch is a bitch to take a picture of since it wraps around the tube and is quite faint) I got this awesome lamp from Jeremy (funkylamp) in a trade a few years ago

IMG_0641.JPG IMG_0642.JPG IMG_0165-4W-BLB-42.JPG IMG_0382.JPG IMG_0383.JPG
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Filename:IMG_0165-4W-BLB-42.JPG
Album name:Lightbulbfun / My Lamps
Rating (1 votes):55555
Filesize:946 KiB
Date added:08 Jan, 2016
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Comment 1 to 9 of 9
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AngryHorse   [08 Jan, 2016 at 09:40 PM]
Shocked 1942!, cool, didn`t know black lights were around then!
Danny   [08 Jan, 2016 at 09:45 PM]
Nice find Dez
Kev   [08 Jan, 2016 at 10:49 PM]
Bloody hell dez this is mint!!!
Andy   [09 Jan, 2016 at 01:21 PM]
Very nice indeed! Cool
LightBulbFun   [09 Jan, 2016 at 01:46 PM]
thanks for the nice comments Smile the sleeve is quite plane with just the makers name and a load of patent numbers stamped on it (I should look those up at some point heh)
Arrowslim   [09 Jan, 2016 at 05:10 PM]
1942 Surprised older than me lol Wink very nice tube
BC5-80   [09 Jan, 2016 at 05:31 PM]
Priceless! Surprised What a specimen. The US was advanced during the birth of fluorescents.
XmasLightGuy   [11 Jan, 2016 at 03:33 AM]
Wow. Quite an awesome find!
Funkybulb   [12 Jan, 2016 at 02:25 PM]
Yes indeed, this came unexpected, when a seller send me a tube that i supose to get , turns out to be a prize peice here.

Comment 1 to 9 of 9
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