![](https://reference.grail-watch.com/wp-content/uploads/2023/12/CH_24675_A-1-square.png)
Montre extra-plate à échappement visible
October 9, 1901
Arthur Graizely is said to have invented the Hebdomas long power reserve watch in 1888. The final design was patented in 1901 as CH24675A.
![](https://reference.grail-watch.com/wp-content/uploads/2023/12/CH_24675_A-1-815x1024.png)
![](https://reference.grail-watch.com/wp-content/uploads/2023/12/CH_24675_A-2-641x1024.png)
Last Update:
Arthur Graizely is said to have invented the Hebdomas long power reserve watch in 1888. The final design was patented in 1901 as CH24675A.