1970 Raleigh 3 speed bicycle I had in college. Nothing that special, they were fairly common in 1970. Eight years later some bike aficionado saw me riding it and said with some envy, "great bike! they don't make'em like that any more." Last time I saw it it was a rusted hulk sitting outside my parent's house shortly before it got hauled to the dump.

Two Confederate rifles used by ancestors in the Civil War my grandmother said were stored in the attic of their old farmhouse in North Carolina. By the time I was old enough to appreciate that and try to find them "the old farmhouse" was an abandoned hulk with everything long since gutted or stolen. Guess those count as firearms but not really something I had and let get away.

Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!