SYSTEM SEA FLEX

Swatch Sistem 51 Automatic (SUTN403A / SUTN403B)

180,00 €

Sale Sold out Taxes included.

5% discount for purchases made in advance via bank transfer or cash payment upon collection. Your price will then be 171,00 €.

In stock

Delivery time 1-2 working days
Free shipping from 60€

Matching bracelets for “SYSTEM SEA FLEX“

Original Ersatzband der Swatch Sistem 51 AM51 ASO30B400 Ersatzarmband aus Silikon

AM51 (Replacement Strap)

Swatch Replacement Strap (ASO30B400)

20,00 €

Taxes included.

Swatch Ersatzband Sistem Polaire AYIS415

POLAR SYSTEM (Replacement strap)

Swatch Replacement Strap (AYIS415)

30,00 €

Taxes included.

SISTEM TUX - Stainless Steel (Replacement Strap)

Swatch Replacement Strap (AYIS405G)

45,00 €

Taxes included.

Product description

SYSTEM SEA FLEX

With the new SISTEM SEA FLEX, Swatch combines this new mechanical series with a flexible strap for the first time, which is available in two lengths and can also be individually shortened. As with the model with the silicone strap, almost everything is kept in dark blue. White hour markers, as well as red and gold dots of various sizes on the dial, add a touch of color. The hands are also in gold, and the second hand is designed in white. At the 3 o'clock position, there is a round date window. The Swatch SISTEM 51 series is an innovative masterpiece because this mechanical watch is not assembled by hand, but for the first time fully automatically. The movement consists of only 51 parts, and this special feature was also responsible for the naming. The watch winds itself through the movement of the wearer and has a power reserve of up to 90 hours.

function Date display
clockwork Automatic (mechanical)
Housing material Plastic
Armband Material Stainless Steel Flex
Glas Material Plastic
Close type without clasp
color Blue
Dial color Blue
case color Blue
Bracelet color Blue
diameter 42 mm x 13.9 mm height
arm circumference A: Large 16 - 19 cm; B: Small 14 - 17 cm
waterproofness 3 bar

Satisfied costumers

4.9/5

Recommended by over 17,800 people

Kurt M

23.05.2026

Very fast delivery,
Watch as described
Top packaging
So everything's great 👍
Furthermore, the shop offers a very good spare parts portfolio, just in case.

Mathias R.

26.05.2026

The two purchased 90s Swatch are in absolutely mint condition, with original protective film on the watch glass and an equally "untouched" original box.

Jonathan O.

27.05.2026

I was looking for a replacement Swatch strap that was impossible to find in the UK, so ended up on Watch Papst due to lack of options. To my surprise it took only 5 days to arrive from Germany so wouldn't hesitate next time! Part was as described and packed well.

Poison M

09.02.2026

Delivery was made as quickly as possible after receipt of the advance payment.
I was especially pleased that the watch was from Citizen It was not delivered in the usual black box, but with the yellow diving cylinder.
I can watch Papst, who watches from Citizen, Union Glashütte, Mido, Swatch or Tissot I highly recommend his professional work and great service.

Herbert B.

11.02.2026

Very accommodating, even with special requests; I was informed promptly and clearly.
Recommended purchase

Eva M

14.02.2026

Everything was perfect - the watch arrived with a new battery and the correct time set, even though it's a relic from 1996.

Jessica E.

18.02.2026

Perfect service and a very beautiful watch. Thank you :-)

Bogdan B.

14.02.2026

To find a new in the box watch from 2003 is really a time capsule! Very satisfied to find such a great shop! Thank you!

Joshua L

18.02.2026

I'm from the USA (Buffalo, NY) and have already bought several watches from watchpapst. Highly recommended!

Christine J.

14.02.2026

The delivery was super fast and the watch was flawless. The packaging was also very good. I'm very satisfied and would order again anytime!

Stefan S

16.02.2026

Easy to find online, comprehensive product information, simple purchasing process, immediate shipping – everything is excellent.

Birgit S

15.02.2026

As always, VERY SATISFIED!! There's nothing to improve, everything is great!
Flawless product, fast delivery, everything perfect.
I've been a customer for many years, and that will continue. I can highly recommend them... Best regards

Nina H.

15.02.2026

Super fast information about the order, prompt shipping, and then the package arrived perfectly packed with a letter and business card – absolutely fantastic!! It couldn't be better! Thank you so much!

Ulrich S

12.02.2026

A huge selection of watch straps, even for older models that are no longer in production. This allows me to continue wearing the watch. With a new strap, it's like new again.

Marieke V.

10.02.2026

Everything went perfectly, from choosing the right bracelet for the order to the fast and punctual delivery!
Everything was great and flawless - I would gladly recommend it anytime!

Gundula V.

09.02.2026

Excellent experience; I was looking for a watch that was no longer available in stores until I found it while searching online. Swatch Papst I stumbled upon it and found the watch I was looking for – simply great, highly recommended!
Thank you for the fast delivery.

Anne H.

16.02.2026

Fast shipping of my desired watch. I particularly appreciated the discreet packaging, which didn't reveal what was inside.