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.
Video on YouTubeThe 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.
gear train
The gear train with its center minute wheel, located under an own bridge, was state of the art at that time.
side view of the gear train
The center second is directly driven.
base 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.
AS 1287 dial side
Of course, the AS 1287 uses a yoke winding system.
Technical data
| Manufacturer: | AS |
| Caliber: | 1287 |
| Size: | 10 1/2''' (measured: 23,2mm) |
| A/h: | 18000 |
| lift angle: | 52.23° |
| Number of jewels: | 17 |
| Escapement: | Pallet lever |
| Balance types: |
Nickel screw balance |
| Shock protection(s): |
Unishock |
| Balance bearing / direction hairspring: | Counterclockwise |
| Moveable stud: | no |
| Adjust mechanism: | Long regulator arm |
| Construction: |
|
| Construction type: | solid construction |
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 2 hole(s) |
| Features: |
|
| References: |
Flume: 1952 4 |
| Mentioning in literature (years): | 1964 |
Usage gallery
Invicta mens' watch