Sellita Caliber SW510 Watch Movement

Manufacturer	Sellita
Caliber Number	SW510, SW510 a, SW510 b
Base Caliber	Sellita SW00
Lignes	13.25”
Overall Diameter	30.4mm
Casing Diameter	30mm
Height	7.9mm
Beat Rate / Frequency	28,800 bph / 4Hz
Jewels	27
Lift Angle	50 degrees
Amplitude Range	200 – 310 degrees
Accuracy Rating	Depends on grade
Power Reserve	56~62 hours
Anti-Shock	Incabloc
Hairspring	Nivaflex NM
Collet	Nivatronic
Balance Wheel	Nickel or Glucydur
Main Plate Material	Brass
Bridges Material	Brass
Chronograph Type	Cam style
Chronograph Layout	3-6-9
Hand Count	6
Functions	Central hours; central minutes; central chronograph seconds; small running seconds subdial at 9:00; 30 minutes chronograph counter; 12 hours chronograph counter; date at 4:00
Hacking Seconds?	Yes
Quickset Date?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	(Please add yours to the comments below…)

The Sellita SW510 is a family of automatic chronograph watch movements with various subdial layouts and pusher styles, based on the SW500.

In Sellita’s own words:

“The SW510 is the “tricompax” version of the SW500. The SW510 therefore offers a traditional chronograph layout, that is, a 30 minutes counter at 3 o’clock, 12 hours counter at 6 o’clock and small second counter at 3 o’clock. Quick setting of the date is activated via the crown. The SW510 has the same watch casing dimensions as the SW500 which means the same casing as well as the same hands as the SW500 can be used.”

SW510 Variations:

There are at least 11 configurations of the calibre SW510. The caliber number are not well-thought out and can create caliber confusion. Also note that technical specifications may change between each version.

All SW510 variants are automatic chronograph movements.

The main two versions of the SW510 are 3-6-9 tricompax layout automatic chronograph movements with two pushers. The main difference is whether it has a date or not:

SW510 a – 3-6-9 tricompax, date at 4:30.
SW510 b – 3-6-9 tricompax, true no-date.

Note: Keep in mind that just because your SW510 watch doesn’t have a date doesn’t mean it is an “SW510 b”. It is possible for a watch brand to use the “SW510 a” with a dial that doesn’t have a date cutout, with a phantom date position.

Other versions include the dual pusher (buttons at 2:00 and 4:00) series: