HDB2 Blue

The original protective case for SEVENFRIDAY watches has been re-designed as HDB2, securing every SEVENFRIDAY model from dirt, water, sand and other hazards. Available in four different colors, each with fluorescent additives that turn the HDB2 into a cool in the dark accessory under UV light. Each HDB2 comes with two different size velcro straps and three silicone adaptors to secure any and all SEVENFRIDAY watch models.

SEVENFRIDAY HDB2 Blue Watch Technical Details

Technical Details

Fits All SEVENFRIDAY Adapters

Three silicone adapters make the HDB2 compatible with all SEVENFRIDAY watches

HDB2 Dimensions

78,5mm (W) x 77,5mm (L) x 28mm (H)

Heavy-Duty Box made of recyclable nylon material.

Cool in the Dark

Four Different Colors

Fluorescent additives turn the HDB2 into a cool in the dark accessory under UV light


Protective Case

Externally secures any SEVENFRIDAY watch from dirt, water, sand and other hazards


Airtight Lock

Black polycarbonate lock with black embossed SEVENFRIDAY logo

Polyurethane and Velcro


Two black polyurethane straps with easy-to-adjust Velcro closure. Small - 30mm x 335mm and Large - 30mm x 470mm

Protective Seal


Black polycarbonate bezel with 4 visible stainless steel screws



Chip that allows authenticity verification via the SEVENFRIDAY Android app

Water Resistant

Black O-Ring

Black silicone O-Ring secures the water proofing of the box to 10ATM (100 meters)

SEVENFRIDAY HDB2 Blue Watch Design Highlights

Cool in the dark



Airtight Latch


Velcro Straps

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