adep said:
My bargain M2 has bright marks and a ding near the viewfinder, but is mechanically sound. Also, and unfortunately, the original M2 viewfinder had been replaced with an M6 (I think) viewfinder.
No, the M4 has the original viewfinder design, which is more resistant to flare, and has 35, 50, 90, 135 framelines. It also has the beautiful engraved top plate - classic!
http://www.cameraquest.com/mguide.htm#M4's
"A lot of people, myself included, consider the M4 to be the last classic standard production M. The M4 generally maintains the finish and feel of the M3/M2's craftsmanship while still having significant new improvements: finder brightlines for 35/50/90/135 lenses, much faster film loading, much faster rewinding with a new rewind lever, and a self resetting film counter which resets every time you remove the bottom plate. The M4 finder was basically a M2 finder, with the 135 paired with 35 frame. The M4 has ALWAYS BEEN one of the best and most popular M's. Only 58,000 M4's were made, compared to 225,000 M3's and 83,000 M2's. This helps keep the M4 prices up. While made primarily in chrome, both black paint and black chrome versions were produced. The M4 became the basis of the later M4-2, M4-P, M6, M6 .85, and M6 TTL. The M4 finder can be changed to the later 28/35/50/75/90/135 finder system of the M6 as a standard Leica upgrade. Personally, I prefer the M4 finder as it is, less cluttered. If you love your M4, about the only change to it I would recommend is to add a hot shoe next time you give it a CLA (clean, lubricate, adjust)."