The cylinder must remain unharmed
What is this thing?
Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
It is imperative.
Please do not bully the cylinder.
Given the originally red colour, the slender shape and the mounting, it was probably a gas bottle for acetylene. The valve is missing. The text mentions "Duisburg", probably the location of the manufacturer.
EDIT: Acetylene bottles have thead for a protective cap. So my next guess is a fire extinguisher.
Acetylene and then you jump to fire extinguisher.
I hope I‘m not near you when you try to fight a fire.
We played with the contrast of the picture and we think the first "u" looks like it is actually an "M". 🤔
No, it's lower part is missing. Same for the B. The text says ~G?S DUISBURG. I can't decipher the name of the company completely ~~, probably RHEINGAS.~~
It's imperative that the cylinder remains unharmed.

What sound does it make if you hit it with a stick?
I would say that a sledgehammer would be the right tool here.
We rapped on the side and it felt very solid, we didn't think to whack it with a stick.
What happens if you light it on fire?
I can't read rusty foreign text very well, but if I had to guess, it probably loosely translates to something like..
'DON'T FUCK WITH ME, BOOM BOOM'
Boba fett vibes
The green colour makes me think it's a halon fire extinguisher.
Green is usually for Argon or other inert gases.
It's red underneath
That's a gas cylinder. Does it have a window shape on it like this ⊞? U find bottle still in use around Europe with that on it. The ⊞ used to be a swassticker but welded over and the cylinders still in use today.
Fire extinguisher the vibes tell me
