Brass perpetual calander

Brass perpetual calender with pen rest and note pad clamp.
The brass on the front has been chased in a leaf design with has been picked out with red enamel creating a blank cartouch.  There are 3 knobs which can be turned to alter the day date and month, there are signs of age related wear. 
Length 18.5 cm width 12cm Height 2.5cm