This is sapphire that is made for the “small” Seiko5 models. Those models usually have 1 mm thick glass, and are 29 or 30mm in width. the sapphire I have had made for these models is flat or double domed. Flat looks like the orignal hardlex, the double domed has a nice dome and looks a bit more fancy. The dome is on the inner side and on the outer side, so there is hardly any distortion of the view on the dial if you look from an angle.
On the inside of the sapphire glass there is Anti Reflection coating, you can choose for blue AR and clear AR. Blue AR has as a slight brown hue, and a white dial will look a bit cream instead of white. The blue glare of the AR will show clearly that there is sapphire installed in your watch.
In the table you can look up the width of the sapphire you need to order for your Seiko5. Flat or double domed: you own taste. Clear or blue AR: your own taste.
|29mm||SNKL41, -43, -45, SNKA01, SNK369, -371, SNK377, -381, SNK601, -605, SNK613, -615, -617, -619, -621|
|30mm||SNKE49, -51, -53, SNK803, -805, -807, -809, SNK563, -567, -573, SNK797, SNKK13, -27, -29, -31, SNKL89, -93|
The sapphire comes in a paper, and the bottom side is the side where the paper is folded to. If you look closely, the facet at the bottom-side is a bit smaller than the facet on the top side.