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# What is the Casecap system?

The Hampden Casecap® system ([U.S. Patents 12,449,770 and D1072657](https://hampdenwatch.com/pages/patents)) combines mechanical precision with personal expression. It appears on the Sullivan in both 37mm and 42mm.

The Casecap lets you switch between a sapphire exhibition display and a solid engraved back, using a secure, tool-free system engineered for durability and alignment.

## How the Casecap system works

The Casecap is composed of three integrated components.

1. **The mounting frame**

   - A precision-machined frame that connects securely to the watch case.
   - Serves as the anchor point for both the exhibition and engraved elements.
   - Designed with a bayonet-style locking mechanism for quick interchangeability.

2. **The exhibition disc**

   - A removable sapphire crystal window offering a full view of the Swiss movement.
   - Locks into the mounting frame via the Casecap coupling, creating a watertight seal.
   - Can be detached without tools.

3. **The engraved Casecap cover**

   - A solid stainless-steel cap engraved through Hampden's Design Concierge program.
   - Attaches in place of the exhibition disc, offering protection and personalization in one.
   - Acts as both a shield and a canvas, turning your watch into a wearable keepsake.

Both the exhibition disc and the engraved Casecap share the same gasket interface, maintaining pressure resistance and dust protection regardless of which is installed.

[Casecap system video](https://www.youtube.com/embed/-6CaGGppnd8)

## Two configurations, one watch

- **Exhibition mode:** show your Swiss automatic movement through the sapphire display.
- **Engraved mode:** replace it with your personalized Casecap to mark a milestone, inscription, or message.

A simple quarter-turn locks each element into place with a reassuring click.

## Why the Casecap matters

Traditional watches force a choice between an exhibition back and a solid one.

The Casecap system removes that compromise, uniting innovation, craftsmanship, and personal storytelling in a single mechanism. It reflects Hampden's belief that a fine watch should connect the wearer to both craft and memory.

## Included with every Sullivan

Each Sullivan includes:

- 1x sapphire exhibition disc
- 1x personalized engraved Casecap cover
- 1x precision mounting frame (factory installed)
- A complete gasket system for water resistance

All components are assembled, inspected, and hand-finished in our Chicago workshop.

## Learn more

To design your engraved Casecap through the Design Concierge, see [how to personalize your Hampden watch](https://hampden-watch.crisp.help/en/article/how-do-i-personalize-my-hampden-watch-1ulwv3v/).

You can also read more about [the Sullivan and the Casecap system](https://hampdenwatch.com/products/model-1-sullivan) on our site.