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"The M4 started production in November 1966, as the direct successor of the M3 and M2, featuring framelines for 35 mm, 50 mm, 90 mm and 135 mm lenses in a 0.72 magnification viewfinder. It has the frame counter of the M3, with automatic reset after reloading. The M4 was the last Leica rangefinder of this era to be predominantly hand-built.
Three ergonomic modifications were introduced in the M4:

- an articulating film advance lever, modernised self-timer and frame selection levers
- an angled crank for rewinding the film that replaced the slow to use telescopic knob of the M3
- a faster loading system that does not require use of a removable spool
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Production of the Leica M4 ceased in 1975. Total production: 47,522 units in silver chrome, 6,775 units in black chrome, 4,889 units in black paint and 31 units in olive green.
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This particular M4 is modified to perfectly compatible with Vintage Leicavit MP.