Without pictures I can only say that these clocks were most popular from about 1910 - 1925 in the Sessions books.
They were called schoolhouse clocks, or sometimes office clocks. They were made with and without calendar function and were mostly time-only when made for a public building so the chiming would not distract people at school/work.
If your clock has a gong or chime, it was probably made for home use in the 1920's.