The brass version of the Layan will develop an individual patina.
The watches show already a little patina, some more some less. 

Movement: Seiko NH35 automatic
Case: 43mm wide excluding the crown - lug tip to lug tip 53mm - height 14mm - weight on leather strap 135g
Case material: Brass
Case back: Screw down stainless steel with individual serial number
Crown: Screw down stainless steel with brass cover 8mm with 3 gaskets
Crystal: Sapphire (single domed), inner AR coating
Dial: Markers with Super Luminova C3 THE WHITE DIAL HAS OLD RADIUM LUME COLOR
Water-resistance: 300m/1000ft
Strap: 24mm - 2 different straps - leather and rubber
Buckle: Brass on each strap