so, i have seen some cooler ones online, but as far as in person or owning one this is the coolest one, i bought it on ebay for $11 it came without a tube and untested, but i put a vintage 22 watt tube i already had in it and it works fine, the started is a bit on the warn out side but still works and makes a nice ping sound, i punched a hole in the end so you can see the neon glow. i am working on uploading a video of it if anyone is interested i will post a link to it once it is uploaded.
I am having issues with the pictures, i will post them in a minute 

i couldn't post them here, hopefully those links work.

here is a video on it.

https://www.youtube.com/watch?v=cefFhiNdtLE

I really like this adapter! It's even better with the vintage Westinghouse tube. Thanks for posting the pictures. Any plans on where you might install it!

quite honestly i have no idea... in my bedroom i have 4 4 foot lights and in my closet i have an f20t12 fixture, I really do not have anywhere that it would get any use with a regular light socket to put it, It is too cool to just put on a shelf and not use, but that is the same story with all my lights and fans and i end up with like 7 lights in one room. the neighbors must think i am growing something or something. I am not, i just like lights. but i am sure i will figure it out after a while.

Sounds like have quite a collection going. I hope you post pictures of your other lights. I've been looking for T12 fixtures but without any luck. But that circline adapter definitely needs a place somewhere!
I'm looking to get into collecting fluorescents but it sure isn't easy!

eh... i have like 6 vintage fluorescent fixtures that i found places. not including the adapter and some more modern but still old ones. it certainly is hard... it seems that people are always just throwing them away and once you realize they are gone it is too late... either that or they have been hacked apart and turned into LED lights. hard to find anyone who would understand that anyone would want an old fixture. there is a bar in my town that used to have like 6 old pre-heat louvered fixtures from the  very early 50s that were 10 feet long, they had 2 4 foot tubes on either side of an incandescent light. they were awesome. all worked, but they re-modeled and replaced them with recessed LED lights. which are so boring. i will see if i can find a picture of those lights.

yeah... i forgot this part... they put red filters over the tubes to give them a red glow. from what i could tell they all still had their original pre-heat ballast intact.

https://drive.google.com/file/d/1S6oX42yHtXPQOUFaEn3fVj3w0TCRVdz0/view?usp=sharing

https://drive.google.com/file/d/1Z0cYzy_oT-tHcmVzeMy8StdZkAUDnmyw/view?usp=sharing

there are also some of what used to be the same fixtures in the other room, but the fixtures were torn apart and had LED strips installed and then a wood box and some sort of egg crate plastic over them.

https://drive.google.com/file/d/1J9b_3JSZkOyKQ_neAs0K0XFhneKcsnYN/view?usp=sharing

eh... i have like 6 vintage fluorescent fixtures that i found places. not including the adapter and some more modern but still old ones. it certainly is hard... it seems that people are always just throwing them away and once you realize they are gone it is too late... either that or they have been hacked apart and turned into LED lights. hard to find anyone who would understand that anyone would want an old fixture. there is a bar in my town that used to have like 6 old pre-heat louvered fixtures from the  very early 50s that were 10 feet long, they had 2 4 foot tubes on either side of an incandescent light. they were awesome. all worked, but they re-modeled and replaced them with recessed LED lights. which are so boring. i will see if i can find a picture of those lights.

Yeah I'd say that about sums it up alright. Someone remodels and some really good older fixtures end up in the trash. I see it a lot working as an electrician. As you mentioned LED recessed lights are incredibly boring! I miss the days of the "Hi-Hats" where the incandescent bulb was recessed like 1ft inside the fixture and the black baffle trims that they had.
The more I look at that adapter that you posted I suspect that it could be from the 50s, which really makes it cool!
Besides U-bend fluorescents I really like circlines.

i couldn't post them here, hopefully those links work.

Hi, you should be able to post these in your message using the attach photo option. It will allow attachments up to 2048 KB or about 2Mb and 4 per post. If you have any troubles with that, feel free to ask us.

it is not that, my upload speed is so slow i cannot upload anything hardly, i have done it before and it takes like 10 minutes to upload full resolution images.

Wow all the detail intact. Right down to the ceramic wire nuts. Like the glass embellishment in the middle.

yep, I like to keep everything as original as I can unless I absolutely cannot for safety or functionality reasons.

Cool fluorescent adapter!

I saw some louvered fixtures just like those at a hardware store in Harlingen TX last year.  They even had the spot lights between sections.  No red filters though.