I just remembered that I’d seen some Mikrograph info on a document I received from Tag Heuer for a vintage watch event. It was not relevant to the event but was text to provide an example of the info required for my watches, so assume it was from another event.
MIKROGRAPH
1ST STOPWATCH ACCURATE TO 1/100TH OF A SECOND.
The accuracy of the timing instruments at that time was of 1/5th of a second. This Heuer innovation revolutionized science, industry and watchmaking.
Mikrograph made Heuer the natural choice as supplier of timing instruments for the 1920 Olympic Games.
Where yours fits into this timeline I have no idea, but the piece that was written about was from 1916.