While this oak stands beside an oak with larger crown and thicker trunk it is easy to overlook it. But after measuring all tops I could hit at with the Nikon Forestry 550 laser, it proved to be even 2.4 m taller than its neighbour!
These were the two tallest oaks I could find in 2 hours of measuring at April 29, 2012 in the valley near Sources de l'Hermitière. Many other oaks I measured were between 40 and 44 m. The beeches in the same valley were most of the time less tall, around 38 to 42 meters. The tallest I measured was 44.6 m.
The forestor of the Forêt de Bercé, Yves Gouchet, in december 2006 measured an oak of 50 m in this valley, that was mentioned as 49.5 m in another source of the Forestry. Very probable he used a Vertex Hypsometer, much used by Forestry professionals, but we think of it as being less reliable compared to laser. See: http://www.nativetreesociety.org/specialreports/bragg/Bragg2007b.pdf .
The girth of the tree, measured at a height of 1.30 m, is 3.13 m (Apr 29, 2012, Jeroen Philippona). Its height is exactly 48.40 m (Apr 29, 2012, laser with Sine method (e.g. Nikon Forestry 550 laser rangefinder), Jeroen Philippona). This tree was planted around the year 1775 ± 50, which makes it around 240 ± 50 years old (Jeroen Philippona, May 1, 2012).