Specs Bergstrom Air

Case Diameter
41.5 mm
Bezel Diameter Fixed- 41.5mm
Crown Push-pull Crown with Silicone Gasket
Hr and Min hand Diamond-cut C3 Lume Filled
Sec Hand Diamond-cut Orange 
Case Material Marine Grade 316L Steel
Case Back Screw Down Exhibition Case Back
Sapphire Crystal Double Domed 2X A/R Coating
Case Thickness 11mm
Thickness w/Crystal 12.6mm
Lug-to-Lug 50mm
Weight 69 grams
Water Resistance 50m
Movement  Swiss Unitas/ETA 6497
Power Reserve 48 Hours
Regulated Accuracy +/- 8 secs/day
Lume Swiss SuperLumiNova C3
Lug Width 22mm