The Elgin 687 is a 10 1⁄2 ligne (23mm) manual wind movement from the USA, most likely from the 1950ies.Video on YouTube
This movement has got synthetic rubies on all important bearings, even for the minute wheel.
The gear train is a classical one: The screw balance in beared in two Incabloc shock protection bearings and beats slowly with 1800 A/h. The hairspring has got a Breguet end coil.
The Elgin 687 does’t have a center second, but at 6 o’clock there’s the fourth wheel, carrying the hand for the subseconds indication.
Escapement- and fourth wheel are located below an own brige, the other gears and the mainspring barrel under a second bridge.
There’s nothing unusual on the dial side; besides the yoke winding system, you can see the dial side Incabloc bearing.
|Number of jewels:||17|
Nickel screw balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Long regulator arm|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||4 hole(s)|
|Size:||10 1/2''' (measured: 23,0mm)|