Daniel,
this is definitely a high class watch.
The ebauche (raw movement) was obviously produced by one of the famous producers of high class movements around 1870.
It will be hard to point out a name , but it could be Audemars, LeCoultre, Piguet and other members of the swiss upper class of producers of the time.
Some adress this type of movement as "Audemars/Juergensen type II".
The watch shows all high class specifications : 20 jewelled basic movement, wolf teeth, a big "chronometer" balance, diameter 19,5mm or more, rounded edges and highly polished parts.
The origininal case, probably 18k, seems to be of high quality and to my experiance will reach more than 50% of the total watchweight.
The construction of the chronograph is an early one with features of early LeCoultre chronographs (google: Faszination Chronographen

as Grand Maison LeCoultre im Vallee de Joux).
Written in german but filled with pictures .
My advice: keep the watch, it will rise in value.
Thomas