There are way too many variables to provide any sort of estimate here. There are two major ways to go. One is to educate yourself. Most libraries have some reference books on antiques and clocks in particular. Finding out the manufacturer of the works and other key items will allow you to determine your next steps.
Another option is to have it appraised by a clock expert. In some cases providing measurements and pictures can allow an expert to make some sort of estimate for insurance purposes.
Grandfather's Clock - 1934 was released on: USA: 29 June 1934
The Mystery of Grandfather's Clock - 1912 was released on: USA: 6 November 1912
Grandfather's Clock - 1912 II was released on: USA: 7 December 1912
December Bride - 1954 The Grandfather Clock 1-16 was released on: USA: 17 January 1955
Family Ties - 1982 Wrap Around the Clock - 7.22 was released on: USA:23 April 1989
The first mechanical clocks were invented in Europe in the late 13th century. The oldest known mechanical clock still in existence is the Salisbury Cathedral clock, which dates back to 1386.
Britain's earliest mechanical clock can be found at Salisbury Cathedral in Wiltshire. It dates back to the 14th century and is one of the oldest working clocks in the world.
The first known mechanical clock was created in England in the late 13th century. It is no longer in existence, but the earliest surviving clock is the Salisbury Cathedral Clock, which dates back to 1386 and is located in Salisbury, England.
The oldest known clock is the water clock or clepsydra, which dates back to ancient Egypt around 16th century BCE. These clocks measured time by the flow of water from one container to another, marking the passage of hours or minutes.
The Grandfather - 1909 was released on: USA: 23 June 1909
The Grandfather - 1912 was released on: USA: 21 September 1912
Grandfather - 1911 was released on: USA: 19 August 1911