Your doll, has most probably, been produced in this way-- the head has been made by Alt. Beck & Gottschalk, Nauendorf, Germany, hence the 1210, for another doll producent Armand Marseilles also Germany.
The exclusion A.M. mark is the American importers wish to be exclusive seller for this doll in America and the name "Mabel " clinches the impression.
Age? 1910 thereafter.This is just a brief explanation. Value? this depends, basically, on demand, size, condition.
