This is a quality 316L stainless steel  watch case with  screw down case back cover. Case back and a crown are rubber sealed. Crystal - Hardened mineral

Water resistance:5 ATM

Diameter: 44mm including a crown, 50mm lugs to lugs.

Case thickness: 12 mm including a crystal

Width between lugs: 20mm

Case internal diameter: 34,5 mm

Diameter of internal shoulder (visible dial): 33 mm

Case internal height from internal shoulder to the edge: 6 mm

Height between internal shoulder to crystal: 3 mm

Height between internal shoulder and stem hole center : 3 mm

Case back cover height including a thread: 4 mm

Crown diameter: 7 mm