c1901 – saw the introduction of the Anniversary trademark on 400-Day clocks. c1663 – minute hands were introduced to longcase clocks.c1775 – matching minute and hour hands were introduced; Although antique clocks were produced with only hour hands until around 1820.
c1780 – second hands began to be added to longcase clock dials.
c1785 – dots in the minute rings of brass dials were added c1745 – phases of the moon were introduced on clock dials .
c1840 – coiled wire gongs were used in English bracket (shelf) clocks.
c1890 – chime bars, also called chime rods, were introduced to clocks. c1882 – Seth thomas introduced clock models in Adamantine veneer finishes which mimicked marble, slate, wood grains and other materials.
Even the type of material used to construct your antique clock movement can help, or discovering when chimes were introduced and the type of chime used.