Blue and Black Office Swivel desk chair by Orangebox 

Orangebox is a great respected brand in office furniture 

The chair is Seat back arm height adjustable. Back tilt and seat depth adjustable with Tension control 

There are minor marks. One on backrest pictured is the biggest one  still quite minor 

Approx size is max seat height 55cms seat width is 47cms and seat depth also 47cms

Nice chair by a great maker