The Sinn 103 B is far more than just a classic pilot’s chronograph. Its origins are closely linked to Helmut Sinn’s personal connections within the Swiss watchmaking and aviation industries. Through his contacts at the airfield, he came to know, among others, the owners of Breguet and Mathey-Tissot personally – relationships that would prove highly significant in the development of this model series.
Inspired by the cockpit clocks and instruments of military and civilian aircraft, several variants of the Sinn 103 Bwere produced during the 1970s, equipped with the renowned hand-wound Valjoux 726 chronograph movement. The design was deliberately geared towards the practical requirements of professional pilots: excellent legibility, a clear dial layout and reliable chronograph functionality.
Of particular interest is the model’s resemblance to the second-generation Breguet Type XX and its civilian versions. During this period, early Type XX chronographs were manufactured and/or assembled for Breguet by Mathey-Tissot. This creates a plausible historical link between the Breguet pilot’s chronographs of the era and the corresponding Sinn 103 B models.
This connection helps explain the striking design and technical parallels: the balanced chronograph layout, the prominent sub-dials, the functional bezel and the consistent focus on cockpit use.
The Sinn 103 B therefore exemplifies Helmut Sinn’s philosophy of combining proven Swiss chronograph technology with German functional design. It is not merely a pilot’s watch, but also a fascinating testament to an era in which personal connections, technical expertise and a passion for aviation came together to create exceptional chronographs.
Sinn 103 B – More Than Just a Pilot’s Watch
SINN 103 B
SINN 103 B – Valjoux 726
The case features a screw-down case back. The black dial is fitted with three sub-dials.
The chronograph features a 30-minute counter at 3 o’clock and a 12-hour counter at 6 o’clock. The running seconds are displayed at 9 o’clock.
The black bidirectional rotating bezel is marked in minutes and features a triangle with a luminous pearl at 12 o’clock.
The exterior of the case back is marked “SWISS MADE”, “STAINLESS STEEL”, and the serial number. Inside, the watch is powered by the hand-wound Valjoux 726 chronograph movement, with the movement signature located beneath the balance wheel.
Two serial number ranges are known: four-digit numbers beginning with “10XX” or “11XX”, as well as six-digit numbers beginning with “358 XXX”.
SINN 103 B
SINN 103 B – Valjoux 726
The case features a screw-down case back. The black dial is fitted with three sub-dials.
The chronograph features a 30-minute counter at 3 o’clock and a 12-hour counter at 6 o’clock. The running seconds are displayed at 9 o’clock.
The black bidirectional rotating bezel is marked in minutes and features a triangle with a luminous pearl at 12 o’clock.
The exterior of the case back is marked “SWISS MADE”, “STAINLESS STEEL”, and the serial number.
Inside, the watch is powered by the hand-wound Valjoux 726 chronograph movement, with the movement signature located beneath the balance wheel.
Two serial number ranges are known: four-digit numbers beginning with “10XX” or “11XX”, as well as six-digit numbers beginning with “358 XXX”.
SINN 103 B
SINN 103 B – Valjoux 726
The case features a screw-down case back. The black dial is fitted with three sub-dials and follows the classic Type XX layout.
The chronograph features a 30-minute counter at 3 o’clock and a 12-hour counter at 6 o’clock. The running seconds are displayed at 9 o’clock.
The black bidirectional rotating bezel is marked in minutes and features a triangle with a luminous pearl at 12 o’clock.
The exterior of the case back is marked “SWISS MADE”, “STAINLESS STEEL”, and the serial number.
Inside, the watch is powered by the hand-wound Valjoux 726 chronograph movement, with the movement signature located beneath the balance wheel.
The serial number is six digits long and begins with “358 XXX”.
SINN 103 B
SINN 103 B - Valjoux 726
Scew-Back case and black dial and three sub-dials. The 15-minute and 12-hour subdials at 3 and 6 o'clock, the permanent seconds subdial at 9 o'clock.
The black bezel can be turned in both directions and has a triangle with a pearl at 12 o'clock and shows minute markers. The outer back cover is signed with SWISS MADE, STAINLESS STEEL and serial number.
The movement is a manual wind Valjoux 726 calibre and signed under the balance.
Serial number starting with 10XX, 11XX and 358 XXX.
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