16 mm refers to the width of the film; other common film gauges include 8 and 35mm. It is generally used for non-theatrical (e.g., industrial, educational) film-making, or for low-budget motion pictures. It also existed as a popular amateur or home movie-making format for several decades, alongside 8mm film and later Super 8 film.” – Wikipedia

Have you ever seen or held such a reel? Tried to feed it through a projector? I’m sure someone out there can share a tale or two about this film reel 😉