Vintage Super Rare 8 DAY Mystery Gravity Driven Inclined Plane Rolling Clock. - $8,000 (San Bruno)

Germen made Vintage Super Rare 8 DAY Mystery Gravity Driven Inclined Plane Rolling Clock.
This very unusual clock is never wound with a key, but does feature a totally mechanical movement.
The Rolling Clock receives its power from acounterweight inside the heavy brass case.
The case slowly rolls down a delicately carved wooden plane, yet keeps the hand-painted porcelain dial upright all the time.
At the end of the running period, simply replace the clock at the top of the plane, and it continues to run, without missing a beat.
This nice clock has 7 jeweled movement.
And thehand carved base is made of rose wood.
Dimension: Movement: 5" in diameterx 3.
5" deep; Base: 5-3/4" highx 23-1/4" widex 5" deep.
You will never need to wind this clock and it's totally mechanical.
This is a vintage 8 day duration rolling clock and highly desirable among collectors because of its extreme rarity.
If you have any questions, please feel free to let me know.
One was sold at auction for $33,000 last year.