The Héron Mirabel GMT in black (ref. 4001-A) is a 37.5 mm dress-style GMT watch. Its C-shaped case is made of 316L stainless steel with a gold PVD coating, measures 43.5 mm from lug to lug and takes a 20 mm strap. The case is 10 mm thick, or 12 mm including the boxed sapphire crystal, which has an anti-reflective coating. The black dial is enamel-painted, with a crosshair sector layout, polished applied Roman numerals, faceted alpha hands and a capped seconds hand. It is powered by the Miyota 9075, an automatic “true GMT” movement that needs no battery. Water resistance is rated at 50 meters.

The watch shows local time, running seconds and a second time zone on a GMT hand that reads against the 24-hour scale around the dial. Because the 9075 is a true GMT, the local hour hand can be jumped independently when you change time zones. The diamond-shaped pilot crown, inspired by early flieger watches, has a cabochon insert, and the “World-Timer” caseback has a hand-painted enamel centerpiece. It comes on a black French Baranil leather strap (125/75 mm) with quick-release spring bars. Héron also makes the Mirabel GMT with white (4002-A, with heat-blued hands), blue and brown dials, and lists the black model at €628.95, with no extra tariffs for US customers.

Reviewers see the Mirabel as a rare thing at its price: a true traveler GMT disguised as a vintage dress watch. Worn & Wound noted how compact the C-shaped case is for a GMT, and Oracle of Time pointed out that its 43.5 mm lug-to-lug makes it wear a little longer than the 37.5 mm diameter suggests. Hands-on reviews from Fratello and others praised the enamel dial work and the case machining for the money. The compromises are 50 m water resistance and a leather strap that limits it as a sports watch. The Mirabel GMT is part of Héron’s current collection, but every colorway was shown as sold out on Héron’s site at the time of writing.