Seiko watch glass 44-20 – vintage mineral glass – NOS

Original Seiko watch crystal with specification 44-20 , from unused old stock (NOS).
The packaging is from中西商店 (Nakanishi Shōten) , a traditional Japanese spare parts dealer from Shinagawa, Tokyo.

The imprintセイコーフトーブ(“Seiko Futōbu”) refers to older Seiko standard glasses according to Japanese type standards.
The handwritten notation 44 / 20 means:

• Outer diameter: 44 mm

• Glass thickness: 2 mm

This is a very large mineral glass, such as was used in vintage pocket watches, large stopwatches, or early special models.

The glass is clear, unused and perfectly suited for high-quality restorations of vintage Seiko clocks or individual watch projects.

Data:

• Diameter: 44 mm
• Thickness: 2 mm
• Type: Seiko standard mineral glass (“Futōbu”)
• Condition: NOS, like new
• Origin: Japan (Nakanishi Shōten)