Review: Sea-Gull M177S

Another Chinese bargain watch – the Sea-Gull M177S.

First impressions are good – it comes in a decent box, with a manual entirely in Mandarin. But manuals are for wimps, right?

The Sea-Gull M177S - great no-frills look

I love the look of this watch. It’s quite understated, the dial and hands are of great standard, and the watch case is nicely finished. A very happy unboxing indeed! 

Talking of boxes – here it is! All nicely done, and let’s not forget this is a £ 80 watch. I got mine off eBay. I wouldn’t be too unhappy getting a £ 500 watch in a case like that. The auto-winder works well and doesn’t make an unpleasant noise, and the watch ticks happily at 21,600 bph / 6 bps. It has the ST-1612-3 movement, which is made by Sea-Gull themselves. Sea-Gull has a very similar model with 8 bps, the 816.351, which comes with a metal strap, but looks almost identical, but you will have to fork out £ 360 or so for that – it uses the ST2130 movement. I have it as my everyday watch, and I love it. Another review for another day….

Onwards and upwards, let’s take our watch apart and see what it is made of!

The glass back allows a look onto the nicely finished movement

From the back, it looks just as nice. You can see the M177S etched into the glass, and the glass back allowing a view of the balance wheel and cock. The back is held in place with 4 screws, which are easily removed.



With the back removed, you can see the rubber seal and a plastic ring holding the movement in place. Yes, I would have preferred metal, but think of the price of the watch ... Functionally, nothing wrong with the plastic. It holds the movement firmly in place and does its job.

I remove the auto winder assembly before taking the movement out of the case. I like the brush pattern on the bridges

With the movement taken out of the case, it's time to remove the hands. The piece of paper with a slit cut into it protects the dial - it would be a shame to scratch it

The aluminium watch face has a holding ring at the back that has two pins

The date ring

Having removed the screw that holds the balance cock, I prise it lose with the help of a screwdriver

Balance cock with balance and hairspring

Now it's time to wind the main spring down. I re-insert the winding shaft, turn it slightly until the click lifts, and insert a piece of sharpened pegwood to lift the click

The third & fourth wheel bridge removed, you can see the escapement wheel. The strip running across the barrel is the click

A close-up of the finish of the bridge. Quite impressive for the money!

All wheels bar the centre wheel removed - this required taking off the cannon pinion from the other side first

This is the arbor that drives the second hand - it goes right through the centre wheel. The rough surface at the bottom end is ok - the second hand has to hold on to that just by friction. The pinion end looks well executed

Close-up of the pallets - one of my very few hairs on the right for size comparison

The escapement wheel under the microscope with the focus on the pinion

The movement is turned around and the date wheel is removed

The date mechanism is now visible

And here is the movement taken apart

The spring for the date wheel click is inserted through a slit in the cover after assembly of the date mechanism - you can see it in on top of the plate ready to be put into place. On my first attempt, it flicked right out and I spent 20 minutes looking for it. It's rather small, but I finally found it

I turn the watch until the date changes, and then mount the hands at 12:00

The movement goes back into the case, the plastic ring is put back and the winding pin is put back into place

And the watch is ticking again happily

All in all, another great Chinese watch considering the price. You have to compare this with an £ 80 watch and not with a Rolex.

I like this one better than the Parnis watches – it is also a little bit more expensive, and has a very nice dial and case.

If I have one point of criticism to make, it’s the noisy auto-winder…

Let’s see how it performs when hooked up to the timegrapher.

Position Accuracy s/day Amplitude Beat Error
FU 0 288 0.1
FD 0 280 0.1
CR -4 235 0.1
CU -7 253 0.1
CD -7 241 0.3
CL -10 251 0.2

You can’t call that shabby for the price of the watch! You can regulate this baby to give you a real live performance of +/- 6s/day or so.
Otherwise a great watch, full marks!

5 thoughts on “Review: Sea-Gull M177S

  1. Hi Christian,
    I’ve one too and realy like this chinese watch even if the rotor is a bit noisy. But I’ve a little problem, I don’t why but the stem is broken into the crown. So I was wondering if you knew someone (like a website) who sold a stem with crown for my m177s. Thanks in advance for your help.
    Very interesting blog where I learned a lot of things about watches.
    Sorry for my basic english, I have missed some english courses when I was kid ;-).

    • Salut Laurent,

      you will have to try to buy a complete movement – the ST1612 – that will come with a winding stem. I don’t know where you can get just a replacement stem.

      Best regards,


  2. Pingback: Sea-Gull M177S Teardown

  3. Pingback: SEA-GULL M177s pictorial review - Page 2

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