The silent 16 mm format was initially aimed at the home enthusiast, but by the 1930s it had begun to make inroads into the educational market. The addition of optical sound tracks and, most notably, Kodachrome in 1935, gave an enormous boost to the 16 mm market. Used extensively in WW2, there was a huge expansion of 16 mm professional filmmaking in the post-war years. Films for government, business, medical and industrial clients created a large network of 16 mm professional filmmakers and related service industries in the 1950s and 1960s. The home movie market gradually switched to the even less expensive 8 mm film and Super 8 mm format.
Regular 16 mm Reversal is scanned in 2300×1750 pixels at a spatial resolution of 2900 dpi and 24 Bits per pixels.
Here is a sample scan from a Regular 16mm Kodachrome film from the late 50s about the Comet De Havilland.
Scanned in 48 bpp linear + gamma correction, colour grading then temporal denoising.