Description

Chair identification

These are PSI Seating Gamma Mesh – GMS(1) task/operator chairs, with the AAT slim height-adjustable arms and a black nylon “Stiletto” five-star base. PSI confirms that GMS is the Gamma Mesh range, with mechanism 1, mesh back, upholstered seat, manual back-height adjustment and black nylon base.

The label also gives us some useful detail:

* Model: GMS(1)
* Mechanism: 1
* Base: Stiletto black nylon base
* Arms: AAT — slim height-adjustable arms
* Fabric: Xtreme Plus – Tobago, colour YS030
* Manufacture/order date: 4 April 2019
* Back: breathable black mesh
* Seat: upholstered
* Back height: manually adjustable

The Tobago fabric is Camira Xtreme Plus YS030. It’s a 100% recycled polyester contract fabric with 100,000 Martindale abrasion resistance, and is fire resistant.

Current specification

Specification

GMS(1)

Seat height

470–600 mm

Seat width

490 mm

Seat depth

450 mm

Overall height

1,010–1,140 mm

Overall width

620 mm

Overall depth

620 mm

User weight rating

150 kg

Guarantee

5 years commercial, 8-hour use

Back

Black mesh

Seat

Upholstered

Base

Black nylon 5-star

Mechanism 1

Arms on yours

AAT slim height-adjustable

So I’d put the new-equivalent value of your exact specification at roughly £170–£200 per chair, depending on the fabric/armrest pricing and whether VAT/delivery is included.

In euro terms, that’s roughly €200–€235 per chair as a sensible new replacement value.

Importantly: these aren’t cheap generic office chairs. They’re commercial/contract-grade PSI chairs, and the 2019 label confirms they were specifically built with the Xtreme Plus fabric and AAT arms.