ISA Caliber 8176/2050

Manufacturer	ISA
Caliber Number	8176-2050
Movement Type	Quartz, battery-powered
Lignes	11.5”’
Diameter	25.6mm
Height	3.7mm (5.7mm total)
Jewels	3
Frequency	32,768 Hz
Battery Cell Number	399
Hand Count	4
Hand Sizes	2.05mm (GMT) / 1.60mm (mins) / 1.20mm (hrs) / .70mm (small secs)
Functions	Central hours; central minutes; central GMT hand (second time zone); small seconds subdial at 2:00; date at 6:00
Country of Manufacture	Swiss made in Switzerland or Far East Assembly in China
Known Models	Android Gauge GMT, Invicta Russian Diver 5855, Invicta Subaqua Noma III GMT 0326 (Add your watches in the comments below…)

The ISA caliber 8176/2050 is a quartz movement with a small seconds subdial and a central 24 hour/GMT hand.

Swiss Made or Far East?

The movement shown here was found in an Invicta Russian Diver watch that says “Swiss” on the dial and caseback, however, the movement itself says China and Far East. ISA officially lists this movement as Swiss Made and Far East Ass’y. This is ambiguous, and it’s unclear why they use the term “Far East” and not China on their documentation.

Similar Calibers:

On their site, ISA has three listings for the caliber 8176 (8176A, 8176B, and 8176C). This post is for the 8176B aka 8176/2050. It has a GMT, date, and small seconds function while the other two variations have alarm functions as well.

Crown/Stem Removal:

Look for the detent button near the crown as pictured below. Gently press it in with your tool while extracting the crown and stem from the watch.

Replacement Price:

At the time of this post, this movement was found at replacement prices of $24.95 USD.

Image Gallery:

The example below is a made in China version found in an Invicta watch.

Next is a Swiss made version, found in an Invicta Subaqua Noma III GMT watch:

This one features “Invicta” laser engraved on the coil cover…

Video:

Tech Sheets (pdf):

Additional Resources:

• More ISA mentions
• More Invicta mentions