Internal components have failed, suspect the copper contacts shown in the final 4 photos with the NeoStore watermark have failed or corroded. Could just require proper cleaning, which I haven't attempted. I purchased this very eBay listing advertised as new condition, it was delivered today, and I swapped the 2 internal components with my lantern as a solution and I'm now I'm selling as parts only: https://www.ebay.com/itm/226051222891

I tested this very lantern with it's original functional internals (the one's that were swapped out) to confirm that the bulb, button, and entire casing are fully functional and in top condition. Requires light cleaning, the specks can be removed. I'm using the prior seller's photos, and the last 4 photos are new. The prior seller only photographed the exterior.

To summarize:
The 2 components shown in the final 4 photos are non-functional. Everything else is fully functional. Selling as parts-only, so if you have good internals (2 parts in final 4 photos), you can refresh and renew your TUF4D1 lantern by swapping in your 2 internal components. Or, may just need proper cleaning of the darkened copper contacts that have been shown.