Did you have a year (or some years) in mind? And are you interested in Met trains all the way to Aylesbury?
From July 1958 ABC: yes, except that peak hour trains omitted Harrow.
My 1950 ABC timetable shows a standard service stopping to Moor Park then Harrow. Intermediate stops to Finchley Road aren't shown. Sunday trains were mostly stoppers. There were a handful of locals from Marylebone at busy times but no regular local service.