Using 1/2" or even 3/4" material, mill the two part housing for the clock mechanism.
Use this EASEL "link":http://easel.inventables.com/projects/NRTt5vdgJ_FyYTNQwWgNIg
Mill the clock hands using a ballnose endmill, this will give those shallow channels.
Use this EASEL "link":http://easel.inventables.com/projects/IbZtBMd9Q9jg_zocO3wfPQ
Switch to a square or fishtail endmill and cut the profile for the clock dials.
Use this EASEL "link":http://easel.inventables.com/projects/PXlMn9Aiyg0aBx-9A_6gzQ
If you decide you want a more traditional clock face you can cut simple hands from an opaque acrylic material.
Use this EASEL "link":http://easel.inventables.com/projects/mph7DYdudPrVP4zjN01ZRA