Breitling Breitling - SB04451A1B1X1 Super AVI B04 Chronograph GMT 46 Mosquito Night Figher

Super AVI B04 Chronograph GMT 46 Mosquito Night Figher

REF. SB04451A1B1X1

4/10

Uncommon

Case

MaterialCeramic, Stainless Steel

Diameter46 mm

Lug width24 mm

ShapeRound

CrystalSapphire

Case backOpen

Water resistance100 m

Dial

ColourBlack

FinishMatte

IndexesArabic Numerals Hands: Syringe

HandsSyringe

Movement

CaliberCaliber B04

Typeautomatic

Reserve70 h

Explore caliber→

In Context

At 46 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 15.9 mm it is a tall case, and it will catch on a cuff. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. 100 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement winds itself from the motion of your wrist. 70 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

SB04451A1B1X1 stands on its own in this catalogue — no other reference here shares its base number. It pairs a black matte dial with a ceramic, stainless steel case. Introduced in 2023. Beyond the time it carries a chronograph and a gmt.

Inside: Caliber Caliber B04

Explore this caliber →

The B04 is the B01 chronograph with a second time zone: an independently set local hour hand and a 24-hour hand for home time. It powers 81 watches in this library, most of them Chronomat GMTs. The base is the in-house [B01](/calibers/breitling-caliber-b01), a column-wheel chronograph with a vertical clutch, a 70-hour reserve, 28,800 vph and 47 jewels, certified by the COSC. The module lets the wearer jump the local hour hand forward or back in one-hour steps from the crown while the chronograph runs, with the date following, so a time-zone change is a few clicks rather than a reset. The red 24-hour hand reads home time against the dial's inner scale. The library finds it under 56 [Chronomat B01 44](/brands/breitling/chronomat-b01-44) references, the 44 mm Chronomat 44 GMT and the 47 mm Chronomat GMT, 11 [Navitimer](/brands/breitling/navitimer) GMTs, 11 Super AVI B04 Chronograph GMT 46s, and one each in the Transocean, Chronoliner and Bentley lines. Cases run from 43 mm to 49 mm, with 44 mm at 38 references, 47 mm at 18, 46 mm at 12 and 48 mm at 11. The [Caliber 24](/calibers/breitling-caliber-24) is the older 7754-based chronograph GMT, and the [Caliber 32](/calibers/breitling-caliber-32) the three-hand GMT without a chronograph.

80 other watches in the library run the Breitling Caliber B04.