Vintage chalkware wall plaque

this is a vintage the coach and horse chocolate condition consistent with age and History some minor nicks and scratches I did not clean it because I do not know how and I do not want to damage or make it lose value as you can see in the photos,it very heavy and have hung on my grandmother's wall from the time I could remember I simply took it off when she passed away and put it in a box and it been there ever since she passed away in the late 90s