Sellita Caliber AMT5100 M

Manufacturer	Sellita
Caliber Number	AMT5100 M
Base Caliber	SW510 M
Movement Type	Mechanical, manual-wind chronograph
Lignes	13.25”’
Diameter	30mm
Height	7mm
Jewels	23
Beat Rate	28,800 bph, 4Hz
Lift Angle	50 degrees
Acceptable Amplitude	200-315 degrees
Power Reserve	~58 hours
Hacking Seconds?	Yes
Quickset Calendar?	Yes
Chronograph System	Column wheel
Anti-Shock Device	Incabloc
Mainspring	Niavaflex
Hairspring Collet	Nivatronic
Hand Count	5
Functions	Central hours; central minutes; central chronograph seconds hand; small running seconds at 9:00; 30 minutes chronograph counter at 3:00
Other Features	3-9 bi-compax style subdial layout, flyback
Country of Manufacture	Switzerland, Swiss made
Known Models	Hanhart Pioneer 417 ES, Hanhart 417 ES 1954 Flyback Panda 39, Hanhart 417 ES 1954 Flyback Reverse Panda 39, Hanhart 417 ES Flyback Panda 42, Hanhart 417 ES Flyback Reverse Panda 42 (Add your watch in the comments below…)

The Sellita Caliber AMT5100 M is a bi-compax manual-wind mechanical flyback chronograph watch movement. It is Swiss made with 23 jewels and a beat rate of 28,800vph.

The AMT in the caliber number means that this caliber was produced by Manufacture AMT SA, a division of Sellita that handles higher-end or custom/bespoke movements.

In Hanhart’s own words:

“In tribute to our long tradition of producing chronographs, we are bringing the flyback function back to our most popular collection. Even the historic 417 ES, originally designed for pilots of the German Air Force, was equipped with “Temposchaltung”, as the flyback function is also called. The mechanism allows immediate measurement of a new timing interval by using the reset pusher. The new, first-class AMT5100 M calibre originates from Sellita’s manufacture AMT department. It controls the chronograph via column wheel and has a power reserve of at least 58 hours when fully wound.” –Source

Additional Resources:

• Official SW510 M tech sheets (pdf)
• List of Sellita movements