Genuine OMEGA Ref. 145-012 67' Type A1 Narrow Ω Dome-shaped Plastic Crystal This crystal was removed and stored from a previously owned OMEGA Ref. 145-012 67'. The early type with the Narrow Ω mark on the top of the crystal is valuable and rare. Includes tension ring. Size: Approximately 34mm. This is a USED item removed from a watch that was in use, so there are minor scratches, but no major dents or impact damage. Image 3 is the product image. Image 4 is a reference image from a specialist book.