Nice tube and packaging!

Very nice artworks, and a pretty early lamp. Since the lamp has the new logo but the box not, it is perhaps from 1973 when that was changed. At the moment I am putting together some older Gro-Lux materials because 2019 is the 60th anniversary of Sylvania's invention of the worlds first plant-growth lamp, and to commemorate this event we will show a historic corner of old marketing materials / lamps at the GreenTech horticultural lighting exhibition in Amsterdam in June. So far I did not find any lamps as old as this - I don't suppose you have any duplicates, that we could do a trade on for something else?

1973, wowsers, older than I thought! I'd have put money on these being '83. I do have spares yes, PM me, I'm sure we can sort something

Awesome find there!

Sadly I was at restore yesterday I found a box where some one use a older Sylvania 20 watt tube in a Crappy Lights of America fitting. inside the Sleeve it was LOA F20T10 and Defuser from it over sleeve and nothing else inside the box. So I Just saved that sleeve incase i find a 20 watt grow lux to stick in there.

i allways thought this etch was early 80's, the cap looks 100% thorn, did thorn make these?