India Whiskey Charlie[IWC Moderator]
9816
Since it's LVMH, everything is in-house under that umbrella...😉
From the Monochrome article:
"Under the hood, the Tiffany Timer houses a movement with great pedigree –
and one that also makes perfect sense from a “Group” perspective with a
customised El Primero 400,
the iconic chronograph from sister brand Zenith. The El Primero 400 is
the most direct descendant of the Zenith integrated, high-frequency
automatic chronograph. It beats at 5Hz and delivers 50 hours of power
reserve."