This is my mini version (+/-17x28x35mm) of a Pertrix Lantern (Nr 672 - 1936). I designed it as a gift/for decoration. It is build around an 'Led Balloon Light' found on AliExpress (I used the Warm White version). https://www.aliexpress.com/item/32487072310.html?spm=a2g0s.9042311.0.0.27424c4dcRiiAH

The led light is 11mm in diameter and 35mm long. I removed the outer sealing ring to press fit it in to the lantern. The switch cap on the back is press fitted on the led light. Turn it to turn the light on/off. The handle is a little weak and only for decoration. I would not use it as a keychain.

Please post your make if you decide to make one. I appreciate that. Good luck.