The M6J is a rare special edition Leica M released in 1994 to celebrate the 40th anniversary of the Leica M series. The "J" stands for "Jubilee" and was manufactured to celebrate the 40 years passing since the M3 was first released. The M6J was a homage to the M3, the first model of the M series. The special edition was produced with total number of only 1640 units with 40 cameras for each year of the 40 years of M production.
They are a hybrid of the M3 and the M6 and new M6J was built into the camera body of the M3. It has the heft and solid feel of the M3 as mainly due to the fact that the M6J was actually built with a lot of the original M3 components. The M6J's viewfinder magnification was increased to 0.85x – bringing it very close to the 0.91x magnification of the popular viewfinder of the M3. Its illuminated framelines were borrowed from the M4, with the viewfinder being adapted to the focal lengths of 35, 50, 90 and 135 mm.