With a diameter less than that of the Military M1 model, the Bell & Ross Military M2 chronograph was designed for NATO helicopter pilots. All of its technical and functional characteristics meet German DIN industrial standards, including resistance to impact and magnetism, accuracy, water-resistance, dial , crystal, etc.
The Military M2 was produced when Bell & Ross and Sinn had a working relationship and B&R's models we slightly modified Sinn watches. The M2 is based off of the Sinn 256 with slight changes of the dial design, numeral font, and watch hands.
|Diameter||Thickness||Water Resistance||Lug Width||Lug-to-Lug||Crown||Movement||Power Reserve|
|39 mm||15 mm||100 m||20 mm||45.5 mm||screw down||Valjoux 7750||40 hours|
These straps are 20mm at the lug and 18mm at the buckle, so they'll fit your OEM tang buckle.