Post Office – Finstown – Opening Hours & Branch Details Post Office is prominently situated on Grinnabrek, about 0.18 miles east of the centre of Finstown (close to Motocross Pitch and Firth Primary School). People can easily get here from Dounby, Finstown Town Centre and Twatt. Doors are open today (Friday) at this location 9:30 am – 12:30 pm. On this page you will find all the information about Post Office Finstown, including the working hours, location info, direct phone and additional essential details.