Aikon Automatic, Pontos S Diver (Add your watch to the comments below…)
The Maurice Lacroix caliber ML 115 (sometimes written ML115) is a Swiss made automatic watch movement with 26 jewels.
No, the Maurice Lacroix caliber ML115 is not an in-house movement. This caliber is basically a Sellita SW200-1 with a Maurice Lacroix branded rotor.
This movement is a Sellita Special (Elabore) grade with perlage and Geneve stripes finishing. Although the Special grade typically ships from Sellita with an Novidiac anti-shock device, the ML 115 is equipped with an Incabloc. It is unclear whether they are ordered this way from Sellita or if ML did the modifications in-house.
Examples of watches with caliber ML 115:
The caliber ML115 pictured below was found in a Maurice Lacroix Pontos S Diver watch (ref: PT6248-SS002-330-1).