This is an unusual 8-day endless chain tall case clock.
Unusual in that most endless chain / rope clocks are 30 hour movements.
The movement looks to have been handmade and not manufactured professionally. The construction is similar to a Morbier movement except, in this case, both time and strike trains are lined up one behind the other. This enables them each to use the same chain to power both trains. As such, there is only one weight used on one continuous chain.
The clock’s case is exceptionally robust, made of solid oak and weighs as much as it looks.