Omega crown 5.5mm thread 120 never used

Rare Omega vintage crown  / Ancienne couronne Omega neuve de stock

New old stock, never used / Neuf de stock

Diameter of the crown : 5.5 mm

Thread 120 / Filetage 120

Total thickness : 2.7 mm with the tube (1.7 mm without the tube)

Tube external diameter : 1.8 mm