Watch cases can be distinguished by material, size and shape.
- Materials (by increasing hardness): Plastic, Brass, Aluminium , Gold,
Silver, Platinum, Palladium, Rhodium, Titanium, Steel, Ceramic
- Size: 10-50 mm, gents °>35 mm, ladies┤ °<30 mm
- Shape: round, square, rectangular, trapezoid, tonneau
- Plating/Coatings: Soft (e.g. brass) or unprecious base materials (e.g.
steel) are upgraded by precious (gold) or harder (Titanium) materials. The
thickness is measured in micron = Ám = 1/1000 mm. Physical procedure with
pressure and temperature (PVD - Physical Vapour Deposition) is distinguished
from anodizing/acid/electrochemical/galvanic plating.
Anodized plating are 5-60 Micron thick - the thicker the more wear resistant.
PVD platings (Cathode atomizer) done with Titanium Nitride, Titanium Carbide or
Wolfram Carbide with platinum or gold inlays are up to 20 times harder and
more wear resistant, therefore only a thickness of 0.5-2 micron is needed.
- Snap-in back costs less, but the max. water resistance achieved is 50
- Screwed back protect the inside of a watch better against dust and
humidity. Can be identified by an outer ring of little notches to set on an
- Display or glass backs of mineral or sapphire visualize the mechanical
movement. Inside an automatic watch, one can see the rotor.
continue reading: Movement