|Winding:||Automatic, Counter-Clockwise Automatic Winding|
|Diameter:||25.60 mm (11.5 ligne)|
|Hands:||Central Hour Hand, Central Minute Hand, Small Seconds Hand at 4:30|
Calibre 8N40 is a skeletonized version of the Miyota 8218 small seconds movement in the Miyota 8200 family. It lacks the date wheel of the 8218 due to skeletonization but is otherwise similar.