The ETA Valgranges A08.L01 is a column wheel chronograph version of the famous works horse the Valjoux / ETA 7750, developed by Longines and used by Omega at one stage.
The following images are for reference of the take apart of one for servicing
Kendal, Cumbria
Cumbria Watch Repair 
Hey Dan, do you recall if this movement had a vertical clutch?
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hi sam – this is a horizontal clutch like the 7750
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