SW300-1

	Brand:	Sellita
	Family:	Sellita SW300 Family
	Height:	3.60 mm
	Jewels:	25
	Reserve:	42, 56 hours
	Frequency:	28,800 A/h
	Winding:	Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding
	Diameter:	25.60 mm (11.5 ligne)
© Sellita Cal. SW300 is a clone of the thin ETA 2892A2	Complications:	Date, Hacking Seconds, Quick Date Correction
	Hands:	Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00

Distinguishing Technical Characteristics
Central-Rotor Automatic Clockwise Balance Cock Screw Regulator Balance, Balance at 12:00
Production: 2008 – Current
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Sellita Calibre SW300-1 is a thin automatic movement designed to be an alternative to the ETA 2892A2. It supports bi-directional winding. Cal. SW300-1 is a slightly-improved version of Cal. SW300 with an updated gear teeth profile. Cal. SW300 was first seen in 2008 and Cal. SW300-1 remains the most common member of the Sellita SW300 family.

Sellita SW300 History

Sellita had long produced movements for ETA, and re-sold assembled kits of Cal. 2892-2 and 2893-2 as late as 2008 with ETA branding. The company also specialized in custom finishing of these movements for many Swiss watchmakers. In 2008, Sellita switched to their own-brand SW300 movement family, though most of the components remained identical. The assortment was still sourced from Swatch Group’s Nivarox but the remaining components were transitioned to other suppliers.

Like the SW200 family, Cal. SW300 was updated shortly after introduction with new more durable tooth profiles as well as updated bridges for the reverser wheels. Movements with this update are denoted with the “-1” model number, and non “dash-1” movements are rarely seen. By 2013, Sellita developed a new pallet bridge for the SW300 movements, eliminating a screw and threading of a positioning hole. In 2021, a new barrel and mainspring increased power reserve from 42 to 56 hours. These components are interchangeable and do not change the movement name.

Sellita SW300-1 Applications

Cal. SW300-1 is used by many manufacturers. In some cases it is referred to as “ETA 2892” even though it does not contain ETA components. It is used with only cosmetic differences as the following:

• Bell & Ross BR-CAL.302 and BR-CAL.318
• Frederique Constant FC-306
• Hublot HUB1100 and HUB1110
• IWC 35110 and 35111
• Montblanc MB 24.09
• Ralph Lauren RL300-1
• TAG Heuer Calibre 7

Cal. SW300-1 is also used with a module for many movements:

• Hublot HUB1112
• IWC 35710, 35720, 35750, and 35800
• JeanRichard JR66
• Montblanc MB 29.15, MB 29.16, MB 29.19, and MB 29.25
• TAG Heuer Cal. 11 (modern), 12 (modern), and 18

Sellita SW300 Family

The SW300 family consists of just three movement models with three simple complications: Date wheel, 24 hour hand, and small seconds. These movements are widely used, however, especially Cal. SW300-1, now that ETA has restricted sales of the similar Cal. 2892A2.

Note that Sellita SW300 movements have four more jewels than their ETA 2892-based counterparts. In 2021, Sellita began fitting all SW300 family movements with a new barrel with longer power reserve of 56 hours rather than the 42 previously specified.