Seagull Caliber 3600k St3600k

Seagull Caliber ST3600K

Seagull Caliber 3600k St3600k

Caliber Number3600K, ST3600K, ST36K, ST-3600K, ST36
Movement Type
Mechanical, manual-wind
4.50mm thick
Beats per hour21,600 vph
Hand Size2.0mm / 1.15mm / 0.27mm (needs confirmed)
Anti-Shock SystemIncabloc
Hacking Seconds?No
FunctionsCentral hours, central minutes, small seconds at 9:00
Country of ManufactureChina
Known Models
Sea-Gull M222SK, Invicta 5001, Invicta 17265, Invicta 1090, Invicta 1088 (Add your watch to the comments below…)

The Seagull caliber 3600K is a mechanical hand-wound watch movement. There are no engravings or inscriptions on the movement, not even a jewel count.

It is said that this caliber ships from the factory without first being oiled or regulated. If you have a brand new, yet poorly performing timepiece with this movement, it’s possible that the watch brand did not service it during assembly.

Gold/Silver Tone Versions:

The ST3600K is available in a steel (silver tone) finish and a gold tone finish. As far as we know, Seagull does not distinguish these options with different caliber numbers. This is odd, because without a way to distinguish between colors, then how do they perform the accounting and inventory management of the caliber? If anyone has even completed a purchase order for this caliber and recall a way to identify the color, please comment below.

What does the K stand for?

Tianjin Seagull is known for their mechanical manual-wind caliber ST3600 which is an ETA 6497 clone movement. The K at the end of 3600K is essentially the skeletonized version of that movement.

ST3600 VS ST36:

This movement is reportedly the same as the Tianjin caliber ST36. Tianjin and Seagull are the same company (Tianjin Seagull Watch Group), but they have offices in Tianjin, China as well as Hong Kong. Apparently the different caliber numbers correspond with where the movements ship out of.

Replacement Prices:

At the time of this post, replacement prices for the Seagull caliber ST3600K were found online in the range of $75.25 – 88.77 USD.

Video of the silver version:

Examples of watches with the ST3600K:

The ST3600K pictured below was found in this Invicta 5001.

Seagull Caliber 3600k

More watches with the ST3600K:

Pros and Cons:

Pros: Based on a solid infrastructure that has been used for decades; Affordable compared to similar Swiss movements; Easy to work on.

Cons: Said to ship from the factory without oil or regulating, therefore if the watch brand doesn’t service the movement during assembly then the watch may have trouble in the future; Parts for Chinese watch movements are not well-organized and not easy to find, so you may need to get parts from another watch, or swap the movement entirely.

Additional Resources:

Venus Caliber 178
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