Identify this chair?  

Search for any indication of a distinguishing mark from the producer.
Take a gander at the joints - Different sorts of joinery were utilized during various time-frames.
Search for saw marks - Straight saw checks by and large demonstrate that part was made before 1800.

@kuriyo unlike andrewflipoff i did not look for sawmarks but remembered @lexi link with the ikeacatalogus https://ikeamuseum.com/sv/ikea-kataloger/

also regognised it

it is a ikea without the wheels maybe sawnoff

https://www.vntg.com/158285/noboru-nakamura-bore-armchair-1970s/

https://ikeacatalogues.ikea.com/sv-1979/page/53

@wesemael. "andrewflipoff".... I love it.

@wesemael, "...maybe sawnoff." I love that one, too.

You all jest, but the bots will be our overlords in a few years.

I've been banging on the door asking for moderators, I even offered to moderate despite not having much time. No response from Design Addict.

I've only just read Mr Flintoffs response and it genuinely tickled me to tears, though. I'll remember to check for sawmarks from the 1800s the next time I'm trying to identify a tubular steel design.