Thank you for submitting your item for appraisal. This appears to be a Kienzle regulator clock manufactured in the Black Forest in the 1880s. These regulator clocks were mass produced and were exported by Kienzle all over the world.
The estimate is based on similar offered or sold at auction. "Asking prices" in the trade have been and can be higher and vary. There is no measurement for the sentimental you might attach to it.