Polished surface (numerals and markers) with engraved matte background.
For the usual Sub design, the numbers and markers are usually recessed. However for this design, we made the background recessed instead. We hope you guys like this slight twist to the iconic design.
This insert has a slope design.
Hence these crystals are required for a better fit:
Sapphire Flat - Type E - Seiko SKX007
Sapphire Double Dome - Seiko SKX007
Sapphire Double Dome - No Bevel Edge - Seiko SKX007
Seiko SKX007, SKX009 & SKX011 series
Seiko 5 SRPDxx series (SKX007 replacements)