The Duke 402 was available in different versions, here’s the base version with (when used) decentral seconds at 6 o’clock.
With 10 1/2 lignes, its diameter is the same as on most pin lever movements, and construction-wise there’s also no difference to other movements, it’s just much more rare.
The base plate shows the simple and cost efficient construction. Of course, there are no jewels used, not even for the balance.
The gear train is the classical one: Mainspring barrel with ratchet on the dial side, directly driven center minute wheel, third wheel, seconds wheel at 6 o’clock and a rather filigrane steel escape wheel.
A pin pallet lever is used as escapement.
The screw-less anular balance with its two legs is not shock protected and runs in metal bearings with metal caps. Its beating frequency of 18000 A/h can be adjusted with a short regulator arm plus scale on the balance cock.
What looks like pressed in metal bushings on the outside of the gear train bridge, is only a mock. In reality, the bearings are simple metal drillings.
On the dial side, which reminds a lot of anEppler movement, you see the pretty well made ratchet at 11 o’clock and the typical rocking bar winding system.
Nickel anular balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||pillar construction|
|Winding mechanism:||rocking bar winding system|
|Setting lever spring:||1 hole(s)|
|Functions:||hour, minute, decentral second|
Flume: K2 -|