Although it is extremely basic, this movement has had enormous success and is still being used as the base for new developments, such as by Hentschel watches for their manufacture movement.
An improved and decorated version of this movement was also produced under the name Girard Perregaux 27.
This movement was one of the easiest to deconstruct, but especially to reassemble.
The movement is not pretty, but the bridges are sturdy and each have several pins. Moreover, the way they are divided means the wheels are easily accessible if you need to correct their position while reassembling the movement.
The dial side is also unimpressive, but the pins are long and everything fits in place nicely. Even the spring is thicker than most and easier to put back in place.
The whole gear train stays in place easily even without the bridges, making reassembly a walk in the park.
Even the pallet fork and its bridge are well built. The bridge has 2 pins making it very stable. The pallet fork sits in a jewel hole with very little wiggle room, unlike on most other movements I have worked on.
