Purchased this chair at an estate sale. Looking for some guidance.

Hello! First time posting on this site. I purchased this chair for $10 last week. It was a deceased dentist's home office chair. I can't find any information on it. The only markings I found are the following. The base of the chair has two markings. One is on the top of the base of the chair. It says "SENG". I'm assuming it is from "The Seng Company". They are based in Chicago, Illinois. The other marking is directly on the front of the base of the chair, near the recline and height adjuster knobs. It looks like an "M", but it is disconnected and in a rounded font. I will post a picture of these if I can figure out how. The other marking I found is on the cloth on the underside of the seat of the chair. It is in white marker and it says "S8 SFC 62H37". Probably just a mark they made while manufacturing it, but who knows. The underside of the armrests are hand nailed with a few imperfections in symmetry of the nailing pattern. The only plastic piece on the chair are the caster wheels, everything else is wood, metal, or leather. Please let me know if you need any other info, but I would like to know the decade of manufacture and maybe who designed this or made it. Thank you so much!! I will include more pictures if I can figure out how.

 

More pictures of the base and markings here.

 

That's going to be 1950s-1960s to my eye. Yep, SENG was registered as a trademark in 1951. The company produced metal parts. The registration expired in 1992.

https://tsdr.uspto.gov/#caseNumber=...TION&caseType=DEFAULT&searchType=statusSearch

Debora

 

I might put this just a tad later, 60s into the 70s.

 

My knee-jerk reaction was early 1970s.

 

I'd think 80's..... boardroom chair, and this was at the head of the table !

 

Welcome aboard!