Hamilton caliber H-31
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H-31 description
The Hamilton H-31 is based on the Valjoux 7753. The H-21 is similar though based on the 7750. These movements most notable change compared to the standard version is the 60 hour power reserve.
The following elements have been modified:
- The entire kinematic chain has been refined, from the barrel to the escapement
- The escapement regulator has been suppressed, facilitating optimal reliability and precision
- The main spring has been improved to increase a typical power reserve of 60 hours.
- The mono-block rotor is distinctively skeletonized with an “H” shape and aviation-inspired cut-outs, a signature of individualization.
Other calibers that are based on the Hamilton H-31:
All watches using the Hamilton H-31 movement:
![Hamilton Pan Europ Auto Chrono (H35756735)](https://cdn.watchbase.com/watch/md/hamilton/american-classic-timeless-classic/h35756735-b1.jpg)
![Hamilton Pan Europ Auto Chrono (H35756755)](https://cdn.watchbase.com/watch/md/hamilton/none/h35756755-e6.jpg)
![Hamilton Khaki Pioneer Auto Chrono (H60416533)](https://cdn.watchbase.com/watch/md/hamilton/khaki-field/h60416533-7a.jpg)
![Hamilton Khaki Pioneer Auto Chrono (H60416583)](https://cdn.watchbase.com/watch/md/hamilton/khaki-field/h60416583-af.jpg)
![Hamilton Khaki Pilot Auto Chrono (H64666135)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h64666135-f7.jpg)
![Hamilton Khaki Pilot Auto Chrono (H64666155)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h64666155-7c.jpg)
![Hamilton Khaki Pilot Auto Chrono (H64666555)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h64666555-c2.jpg)
![Hamilton Khaki Pilot Auto Chrono (H64666735)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h64666735-e4.jpg)
![Hamilton Khaki Navy Sub Auto Chrono (H78716333)](https://cdn.watchbase.com/watch/md/hamilton/khaki-navy/h78716333-99.jpg)
![Hamilton Khaki Navy Sub Auto Chrono (H78716983)](https://cdn.watchbase.com/watch/md/hamilton/khaki-navy/h78716983-83.jpg)
![Hamilton Khaki Pilot Pioneer Auto Chrono Black / Bracelet (H76416135)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h76416135-46.jpg)
![Hamilton Khaki Pilot Pioneer Auto Chrono (H76456435)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h76456435-c2.jpg)
![Hamilton Khaki Pilot Pioneer Auto Chrono (H76416735)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h76416735-3f.jpg)
![Hamilton Khaki Pilot Pioneer Auto Chrono (H76456955)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h76456955-f.jpg)
![Hamilton Khaki Pilot Pioneer Auto Chrono (H76416755)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h76416755-20.jpg)
![Hamilton Khaki Pilot Pioneer Auto Chrono (H76416155)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h76416155-5d.jpg)
![Hamilton Khaki Pilot Takeoff Auto Chrono (H76786733)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h76786733-c3.png)
![Hamilton Intra-Matic 68 Auto Chrono Stainless Steel / Black / Strap (H38716731)](https://cdn.watchbase.com/watch/md/hamilton/timeless-classic/h38716731-ef.png)
![Hamilton Intra-Matic 68 Auto Chrono Stainless Steel / Blue / Strap (H38416541)](https://cdn.watchbase.com/watch/md/hamilton/timeless-classic/h38416541-88.png)
![Hamilton Intra-Matic 68 Auto Chrono Stainless Steel / Silver / Strap (H38416711)](https://cdn.watchbase.com/watch/md/hamilton/american-classic/h38416711-5d.jpg)
![Hamilton Intra-Matic 68 Auto Chrono Stainless Steel / Green / Strap (H38416560)](https://cdn.watchbase.com/watch/md/hamilton/american-classic/h38416560-e8.jpg)
![Hamilton Intra-Matic 68 Auto Chrono Stainless Steel / Green / Mesh (H38416160)](https://cdn.watchbase.com/watch/md/hamilton/american-classic/h38416160-31.jpg)
![Hamilton Intra-Matic 68 Auto Chrono Stainless Steel / Blue / Mesh (H38416141)](https://cdn.watchbase.com/watch/md/hamilton/american-classic/h38416141-8f.jpg)
![Hamilton Intra-Matic 68 Auto Chrono Stainless Steel / Silver / Mesh (H38416111)](https://cdn.watchbase.com/watch/md/hamilton/american-classic/h38416111-e4.jpg)
![Hamilton Khaki Pilot Takeoff Auto Chrono Limited Edition (H76776733)](https://cdn.watchbase.com/watch/md/hamilton/khaki-aviation/h76776733-8d.jpg)
![Hamilton Intra-Matic 68 Auto Chrono Janie Briant Today (H38426820)](https://cdn.watchbase.com/watch/md/hamilton/american-classic/h38426820-e9.jpg)
![Hamilton Intra-Matic 68 Auto Chrono Janie Briant Tomorrow (H38436830)](https://cdn.watchbase.com/watch/md/hamilton/american-classic/h38436830-6f.jpg)
![Hamilton Jazzmaster Performer Auto Chrono 42 Stainless Steel / Blue (H36616640)](https://cdn.watchbase.com/watch/md/hamilton/jazzmaster/h36616640-fe.jpg)
![Hamilton Jazzmaster Performer Auto Chrono 42 Stainless Steel / Black (H36606730)](https://cdn.watchbase.com/watch/md/hamilton/jazzmaster/h36606730-ea.jpg)
![Hamilton Jazzmaster Performer Auto Chrono 42 Stainless Steel / Black / Bracelet (H36606130)](https://cdn.watchbase.com/watch/md/hamilton/jazzmaster/h36606130-69.jpg)
![Hamilton Jazzmaster Performer Auto Chrono 42 Rose Gold / White (H36626710)](https://cdn.watchbase.com/watch/md/hamilton/jazzmaster/h36626710-86.jpg)
![Hamilton Chrono-Matic 50 Auto Chrono Limited Edition (H51616731)](https://cdn.watchbase.com/watch/md/hamilton/chrono-matic/h51616731-c6.jpg)
![Hamilton Jazzmaster Performer Auto Chrono 42 Stainless Steel / Blue / Bracelet (H36656140)](https://cdn.watchbase.com/watch/md/hamilton/jazzmaster/h36656140-4f.jpg)