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Hello - searched the forum a bit for a resource for choosing a replacement glass - see my Ebay find attached. The Swiss department store house brand "Mirexal" has no info that I can chase down on Google, so I went through the Sternkreuz catalog and came up with a couple options. Based on measuring the existing glass, and looking at the tension ring mounting arrangement (see sketch), and the approximate profile, I found these be an approximate match for OD, ID (on the tension ring, which sits ON the dial face), and inner dome height for hands clearance: - Mikado 4G 3009 - SK# XAC 300.615 - Seiko - SK# XAC 301.621 - Seiko - SK# XAC 301.640 Only one is stocked on Cousins, although the Mikado can be ordered. And if I order a 30.1mm crystal with tension ring, and the ID of the case measures 30.0mm, will I struggle with pressing the crystal into place? Seems like a lot of interference to me. This feels like a lot of guessing and approximations. Is there an alternate approach? PS - under that cracked crystal was a near-mint, lovely blue dial and an ETA 2789 movement in great shape. Until i pinged the Date Jumper Spring into the ether a while ago...