Fonderie 47 Inversion Principle – From Deadly Weapons to Stunning Timepieces By Frank Geelen 03/04/2013 4 min read
Grönefeld launch the One Hertz Techniek and One Hertz Techniek Nocturne By Frank Geelen 18/01/2013 4 min read
Award winning Grönefeld One Hertz now also in platinum and titanium By Frank Geelen 05/03/2012 2 min read