Staff at a Post Office in Kings Heath will walk out in protest over jobs, pay and closures today.
Commercial Workers Union members will be protesting outside the branch as it is one of 70 that could be closed or turned into a franchise.
300 Crown Post Office staff members, from across the UK, are expected to walk out in support of the protest.
The Post Office say that nearly 12,000 branches are unaffected.
More top news
A drier, brighter but colder day than Thursday. Sunny spells are likely, although it will turn cloudier in the afternoon.
A generally fine and dry day. Sunny in the morning, with thickening cloud and strengthening winds in the afternoon.
A cold night, with clear spells developing for most. Tomorrow, generally fine and dry with plenty of sunshine, especially in the morning.