Seiko Seikomatic Slim Watch Crystal T353 – Ø 35.3 mm – Domed – Vintage Watch Glass – NOS

Original Seiko watch crystal from unsold old stock (NOS) for the Seiko "Seikomatic Slim". Labeled on the original packaging as "Matic Slim" (マチックスリム), reference T353, with the Seiko "S" trademark. The "353" corresponds to the diameter of 35.3 mm.

The Seikomatic series was Seiko's top automatic model in the 1960s – positioned below the later luxury lines King Seiko and Grand Seiko, but above the Sportsmatic models. The particularly flat "Slim" version came from the Suwa-Seikosha factory and combined high precision with an elegant, flat dress case.

It is a domed crystal (total height 2.8 mm), without a magnifier. The packaging does not explicitly state the material; domed crystals of this type are usually made of plastic/acrylic glass.

The black original packaging with the "S" logo is in a classic vintage style. The crystal itself is unused, clear and without scratches; signs of age are only found on the packaging.

Measurements:

• Shape: round, domed
• Diameter: 35.3 mm
• Overall height (domed): 2.8 mm
• Reference: T353 ("Matic Slim")
• Suitable for: Seiko Seikomatic Slim