Built-in double-exposure on a 16mm still camera is probably very uncommon or unavailable. However, some 16mm still cameras with mechanical shutter reset/film advance and Bulb mode may let you create double exposures by manually preventing the film from advancing while resetting the shutter.

In other words, the feature may not be dedicated or labeled as “multiple exposure,” but certain fully mechanical designs can sometimes be manipulated to do it. Two models mentioned as possible candidates are the Zany 16 and Rubina 16.

If you’re shopping, focus on mechanical 16mm still cameras with:

• Bulb mode
• Manual shutter cocking/reset
• A film advance mechanism that can potentially be disengaged
• Better-built lenses rather than toy/plastic designs

Because these cameras are niche and often old, confirm the exact operation from a manual or seller demonstration before buying.