The Arceau Très Grand Modèle

From Hermès 

Courtesy of Hermes

Based on a design from Henri d’Origny in 1978, the Arceau Très Grand is available in both a self-winding and a quartz version. The automatic (above) utilizes the Hermès H1837 movement.  This is self-winding and offers hours, minutes and date at 6 o'clock.  The power reserve is 50 hours.

The case is of stainless steel (316L) and measures 40 mm in diameter.

Here are the pertinents, straight from the source:

CASE
Designer: Henri d’Origny (1978)
316L stainless steel case
Round, 40 mm diameter, 20 mm inter-horn width
Size: very large model (TGM for Très Grand Modèle in French) Anti-reflective sapphire crystal and caseback
Water-resistant to 3 bar 

DIAL
Hazelnut brown, raised black gold Arabic numerals,
stamped chevron motif, sunburst chapter ring, black gold hands

MOVEMENT
Manufacture Hermès H1837 movement Mechanical self-winding, Swiss made 26 mm (11 1⁄2’’’) in diameter
3.7 mm thick
193 components, 28 jewels
Frequency of 28,800 vph (4Hz)
50-hour power reserve
Decoration: circular-grained and snailed mainplate. Satin-brushed bridges and oscillating weight. “Sprinkling of Hs” motif

FUNCTIONS
Hours, minutes, date

STRAP
Etoupe matt alligator equipped with a 17 mm pin buckle in 316L stainless steel

The quartz model (below) bears the same measurements, same case design and size, but the dial is blue, and as mentioned above, the movement is (Swiss) quartz.

Courtesy of Hermes

Here are the pertinents -

CASE
Designer: Henri d’Origny (1991)
316L stainless steel case
Round, 40 mm diameter
Size: very large model (TGM for Très Grand Modèle in French) Anti-reflective sapphire crystal and caseback
Water-resistant to 3 bar 

DIAL
Blue lacquered, powdered and silvered transferred Arabic numerals, rhodium-plated hands

MOVEMENT
Quartz, Swiss made
23.3 mm (10 1⁄2’’’) in diameter 1.95 mm thick
9 jewels

FUNCTIONS
Hours, minutes, date at 6 o’clock

STRAP
Abyss blue matt alligator equipped with a 17 mm pin buckle in 316L stainless steel