Bergstrom MkIV

$1,099

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01 · The story

Bergstrom:
A Brief History

On December 8 1941, Captain John August Earl Bergstrom, 34, was serving as an administrative officer with the 19th Bombardment Group at Clark Field in the Philippines when he was killed. A graduate of Texas A&M University, Capt. Bergstrom was the first Austinite to be killed in World War II.

On March 3, 1943, the Del Valle Airfield was officially renamed the Bergstrom Army Airfield. Today, Austin Bergstrom International Airport has become one of the busiest airports in Texas.

02 · Colorways

Two cases. Two dials.
One Horizon.

01 Steel · Black Horizon 02 Steel · Blue Horizon 03 Black PVD · Black Horizon 04 Black PVD · Blue Horizon
04 · Anatomy

Every part, named

41.5mm case. 50mm lug to lug. 11mm thin. Four things worth knowing before you put it on.

Sapphire crystal Double domed, 2x anti-reflective coating
Diamond cut hands Swiss C3 lume on the hour and minute, orange seconds
Framed date window New on the MkIV
Polished case 316L steel, or black PVD
Screw-down crown Double silicone gaskets
Open case back Screw-down, sapphire, shows the decorated movement
05 · Movement

Swiss-made heart

Swiss Sellita SW261-M, elaboré grade, hand wound. Highly decorated with Geneva stripes and blue screws, with 48 hours of reserve. The art of daily interaction with superb hand winding is still a fundamental piece of ownership.

Every Bergstrom is regulated and timed in my Austin shop before it ships, to within 4 seconds a day.

±4 sec/day Regulated by hand, in Austin
48 hours Power reserve
15-20 winds A day is plenty
SW261-M Sellita, manual wind
06 · What's included

Bracelet and strap.
Both in the box.

Every Bergstrom ships on a polished mesh bracelet with an easy-to-use sliding buckle, with an Epsom leather strap in the box.

Each piece is numbered; only 300 in this batch, and only 50 in black PVD.

07 · The shop

Made in Austin

I've had a lifelong love affair with mechanical watches. From my first watch at age 8 to inheriting my grandfather's old Wyler from my mother, they've always been central to my life.

Every DuFrane is built by hand in my Austin shop. I regulate each movement. I test every piece.

08 · Details

The specifics

Everything measured, nothing rounded.

41.5mmCase width
50mmLug to lug
11mmHeight
22mmLug width

Swiss Sellita SW261-M elaboré · 316L steel or black PVD · Manual wind · 50m

Case

Marine grade 316L steel, polished silver or black PVD. 41.5mm across, 50mm lug to lug, 11mm thick (12.6mm with the crystal), 22mm lugs. 65 grams with the leather strap.

Crystal

Double domed sapphire crystal with 2x anti-reflective coating. Screw-down open sapphire case back.

Crown

Screw-down crown with double silicone gaskets.

Dial and hands

The Horizon dial with a framed date window. Diamond cut hour and minute hands with Swiss C3 lume; diamond cut seconds hand in orange.

Movement

Swiss Sellita SW261-M manual wind, elaboré grade, date complication. 48 hour reserve. Highly decorated with Geneva stripes and blue screws. Regulated to +/- 4 seconds per day.

Winding

This is a manual wind movement: stop winding once you feel some tension. 15 to 20 winds a day is plenty, then screw the crown back in.

Water resistance

50 meters / 164 feet.

Bracelet and strap

Polished mesh bracelet with a sliding buckle, and an Epsom leather strap, both included.