Longines 27M, Shock resist

• Movement number: 8 220 942 (aprox: 1951).

Technical data LONGINES 27M

• 17 jewels, manual winding, sub second.
• Size: 12''' 27,0 mm.
• H: = 3.2 mm.
• N: = 18.000 A/h.
• Power reserve: 40 h.

Versions:

• 27.0:     sub second, Breguet hairspring, H=4,25 mm.
• 27.0 S:  sweep second, Breguet hairspring, H=5,45 mm.
• 27.0:     shock resist, sub second, Breguet hairspring.
• 27.0 S:  shock resist, sweep second, Breguet hairspring.
• 27M:    sub second, flat hairspring, H=3,20 mm.
• 27MS:  sweep second, flat hairspring, H=4,30 mm.
• 27M:    shock resist, sub second, flat hairspring.
• 27MS:  shock resist, sweep seccond, flat hairspring.