Reference:3132: Difference between revisions

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| movement

| Cal. 630 (~~9¾'''~~, centre sweep seconds)

| Cal. 630 (9¾′′′, centre sweep seconds)

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| companion reference

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== Cal. 630 ==

Cal. 630 is the centre-seconds counterpart to Cal. 620. Same ~~9¾'''~~ NA format, same 17 jewels, same 18,000 bph train, same roughly 40-hour power reserve, same 360-degree unidirectional rotor, same Super Balance, same Swiss lever escapement with Breguet overcoil hairspring. The architecture is shared, and so is the parentage. Cal. 630, like Cal. 620, was developed under Emile Borer at Aegler as part of the Perpetual program that began with the 1931–1933 patents.

Cal. 630 is the centre-seconds counterpart to Cal. 620. Same 9¾′′′ NA format, same 17 jewels, same 18,000 bph train, same roughly 40-hour power reserve, same 360-degree unidirectional rotor, same Super Balance, same Swiss lever escapement with Breguet overcoil hairspring. The architecture is shared, and so is the parentage. Cal. 630, like Cal. 620, was developed under Emile Borer at Aegler as part of the Perpetual program that began with the 1931–1933 patents.

Cal. 630 reworks the motion works so the watch can carry center seconds instead of a subsidiary register. It keeps most of the 620 train but adds an indirect seconds drive. That is the practical movement change buyers are really looking at on the reference.

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 |-
 | movement
-| Cal. 630 (9¾''', centre sweep seconds)
+| Cal. 630 (9¾′′′, centre sweep seconds)
 |-
 | companion reference
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 == Cal. 630 ==
-Cal. 630 is the centre-seconds counterpart to Cal. 620. Same 9¾''' NA format, same 17 jewels, same 18,000 bph train, same roughly 40-hour power reserve, same 360-degree unidirectional rotor, same Super Balance, same Swiss lever escapement with Breguet overcoil hairspring. The architecture is shared, and so is the parentage. Cal. 630, like Cal. 620, was developed under Emile Borer at Aegler as part of the Perpetual program that began with the 1931–1933 patents.
+Cal. 630 is the centre-seconds counterpart to Cal. 620. Same 9¾′′′ NA format, same 17 jewels, same 18,000 bph train, same roughly 40-hour power reserve, same 360-degree unidirectional rotor, same Super Balance, same Swiss lever escapement with Breguet overcoil hairspring. The architecture is shared, and so is the parentage. Cal. 630, like Cal. 620, was developed under Emile Borer at Aegler as part of the Perpetual program that began with the 1931–1933 patents.
 Cal. 630 reworks the motion works so the watch can carry center seconds instead of a subsidiary register. It keeps most of the 620 train but adds an indirect seconds drive. That is the practical movement change buyers are really looking at on the reference.