Its a pretty Standard Swiss bar movement with cylinder escapement..With lepine IV-like style...pre 1860? La Fabrique d’ébauches P.-E. Jaccottet también fabricó ébauches del calibre Lépine IV, el cual se utilizó de 1835 a 1850 Escape (mecanismo que permite acompasar la frecuencia en la marcha del reloj) de cilindro
found one similar but even less jeweled one the web
and one lupine IV style
even an Stauffer Son & Co. Chaux-de-Fonds factory one
Cylinder escapement
Brass balance wheel, no temperature compensation
Going barrel - no fusee - typical Swiss arrangement
Fully bridged - no top plate, unlike the full and three quarter plate movements described by Lecluse.
Key wind and set
Jeweled to the third wheel with clear jewels
Gilded plates and bridges, blued screws