This part of ISO 14368 specifies the dimensions and tolerances of mineral and sapphire watch-glasses. It is applicable to round, flat watch-glasses, typically of diameter 8 mm to 35 mm.
ISO 14368-1:2000 history
2006ISO 14368-1:2000/cor 1:2006 Mineral and sapphire watch-glasses - Part 1: Dimensions and tolerances; Technical Corrigendum 1
2000ISO 14368-1:2000 Mineral and sapphire watch-glasses - Part 1: Dimensions and tolerances