Longines 633-9433, Balance stop spring

• LONGINES original part in factory sealed packaging.

• Fits Longines cal: 633.1, 633.2, 634.1, 634.2, 636.1, 636.2

Versions, suffix 1 = 25 jewels, 2 = 17 jewels.

• 631: without second.
• 632: center second, hack feature.
• 633: center second, hack feature, date.
• 634: without second.
• 636: center second, hack feature, day, date.