The movement is Caliber 15, modified so that the minute counter makes one full rotation in 15 minutes (and clicks at half minutes) rather than the usual 30 minutes.
Long time not heard form you, really hope you are well and enjoy life !!!! Yes, it is a long time that i posted last at Purists, but i always try to read here if time allows! And I am also very glad that you have a Heuer Forum here, GREAT !! All the best to you and till soon again! yours W