The Alpina Seastrong Diver 300 Heritage Automatic AL-520BY4H6 refers to the original Alpina Diver 10 Seastrong model from 1969 and will appeal mainly to lovers of diving watches. However, thanks to its features and design, it can be used not only for diving, but also for everyday wear.
The stainless steel case houses the Swiss mechanical automatic movement AL-520 (based on Sellita SW200) with 26 jewels, which operates at a frequency of 28800 vibrations per hour. The clear dial, which is based on the design of the historic Alpina Diver 10 Seastrong model, is protected by a sapphire crystal, which is highly resistant to scratches. The iconic model is also recalled by the design with two crowns, with the crown at position 4 used to set the time, while the crown at position 2 can be used to set the internal rotating bezel, originally used to determine decompression time.
The AL-520BY4H6 model is supplied with a leather strap and the package also includes an additional rubber strap. Thanks to the case diameter of 42 mm, it fits most men's wrists well. The water resistance of this watch is 300 m, so it is also intended for deep diving.
Not sure about the size?
See the watch on a wrist
| Brand | Alpina |
| Gender | Male |
| Style | Dive, Sports |
| Origin | Swiss |
| Guarantee | 5 years |
| Waterproof | 300 m |
| Movement | Automatic |
| Caliber | AL-520 |
| Movement accuracy in seconds | ±15 s / day |
Power Reserve ![]() |
38 hours |
| Case size | 42 mm |
| Case height | 12,3 mm |
| Case shape | Round |
| Case material | Stainless steel |
| Case color | Silver |
| Crystal material | Sapphire |
| Dial | Analog |
| Dial color | Black |
Threaded lid ![]() |
Yes |
| Strap material | Leather |
| Strap Width | 21 mm |
| Strap color | Brown |
| Date | No |
| Functions | Swivel bezel, Screw-on crown, No date |
Screw-on Crown ![]() |
Yes |
Luminescence ![]() |
SuperLuminova hands and indexes |
| Other functions | Inner bezel, 26 jewels, 28800 vibrations/hour. |
We guarantee the accuracy of the data. Did you find a mistake? Let us know and get 8 EUR on Watch purchase.
Guarantor: Kateřina Žváček
Martin Jasovský
+420252252308
Mo-Th 9-19
Fr-Sa 9-16
info@helveti.eu
The product is included in categories
Men's automatic watches Men's steel watches Men's Swiss watch Alpina Men's silver watches Men's sports watches Men's Watches Alpina Diver Heritage Men's black watches Men’s Watches Alpina Diver Heritage Men’s Watches Alpina Seastrong Men's watches over 400 EUR Men's dive Watches Men's mechanical watches Men's brown watches Men's watches with leather strap Men's watches with sapphire crystal
Alpina is again a step higher for us, a step among traditional watch manufacturers who are characterized by something innovative. Alpina's history dates back to 1883. Nevertheless, it remains a modern brand and the proof is the new models with smartwatches. Alpina has several watchmaking patents and its own solutions: Flyback chronograph, Tourbillon and the perpetual calendar. The brand is very nice to us with its sporty approach.
Helveti.eu is an authorized dealer and specialist of the Alpina brand.
Manufacturer information: Alpina Watch International SA, Rte de la Galaise 8, 1228 Plan-les-Ouates, Switzerland / contact@alpina-watches.com
Do you have a question? Leave us a comment
Add a query
1 → We check, clean and set
We will check the functionality, set time, date and clean the watch carefully.
2 → We will carefully pack the watch
So that the watch does not have a chance to be damaged. We use special vacuum pads.
3 → We insure the watch against damage from the carrier
To be sure, we will insure the watch against breakage, so there is nothing to fear.
With each watch, you will receive a gift of your choice from us. Gifts are graduated according to the value of the order.
From €0 = Cleaning cloth, with which you can polish the glass of a watch.
From €100 = Stroke shortener, you can adjust the watch bracelet to your hand.
From €150 = Helveti canvas bag.
From €150 = Credit card knife.
From €170 = Donut watch case.
From €400 = Parker Jotter.
From €600 = knife Mikov 100-NH-2A blue.
From €1000 = Victorinox Waiter knife with 9 functions.
From €1400 = Watchroll for 2pcs.
From €1650 = Helveti leather watch roll.
From €2000 = Leather travel case.
From €2800 = Leatherman REV.
From €4000 = Wooden watch box Helveti.
From €6000 = Watch winder Helveti black.
And on top of that, a 5-year warranty (You can find the terms of the extended warranty here) and free shipping.
You can view the gifts here: