AS 1287

AS 1287
AS 1287

Description

The AS 1287 is a typical, well made swiss hand wound movement, which debuted in the late 1940ies. It's direct relative is the AS 1187, which only differes by a taller and more angeled gear bride.

The screw balance is beared in two shock protection systems. On the specimen shown here, they are Unishock bearings. The Balance beats slowly with 18000 A/h.

motion works
motion works

The gear works with its center minute wheel, located under an own bridge, was state of the art at that time.

motion works, side view
motion works, side view

The center second is directly driven.

main plate
main plate

The AS 1287 uses rubies on all important bearings. On the specimen shown here, there are also three additional cap jewels, two for the escapement wheel and one on the dial side of the third wheel. On this position, a cap jewel is almost overkill, since the third wheel turns pretty slow and with big force, and additionally, since the dial side of a watch is normally on top, the axle won\'t even touch that cap jewel.

dial side view
dial side view

Of course, the AS 1287 uses a yoke winding system.


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Technical data

ManufacturerAS
Caliber1287
Number of jewels17
EscapementAnchor with pallets
BalanceNickel screw balance
Shock protection(s)Unishock
Balance cock directioncounterclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel
Center wheel
Mainspring barrel
Construction typesolid construction
Bridge shapeAxe, handle right, bulfe left, 3 gears
Winding mechanismyoke
Setting lever spring2 holes
FeaturesSCD
FunctionsHour, minute, second
Beats per hour18000
Size101/2\'\'\' (measured: 23,2 mm)
Image in Flume Werksucher 1952 4
Factsheet

Usage gallery



Links
Ranfft Uhren: AS 1287 (de) (en)