The Longines 27M watch movement, similar to the ETA 717 movement but with lower specifications, is equipped with an early Incabloc shock device. The differences between the Longines 27M and the Zentra 295 movements are unclear. There are various samples of the Longines 27M movement that exhibit both bridge layouts shown in the archived records. The Longines 27M movement is a manual wind movement with sub-second functionality, and it was primarily used around the year 1935.