Watches. I have about a dozen, and most are solar. Most of those are atomic as well, so I neither have to reset them or replace batteries. I don’t need that many, but I like them. There’s nothing particularly special about any one of them, nor are any of them valuable.
Pocket knives. I have no idea how many I have. I don’t know where all of them are. I do know they’re not all in one place, though, because every now and then I find one someplace that makes little sense. I have one I carry almost every day, and I have a butterfly knife because I think it looks cool to handle it. A few are Swiss Army, I have at least two Bucks (different models), and a bunch of others of varying quality.
Sunglasses. I keep at least one pair in each car. I have two pairs in my ski locker. I have a pair sitting on a plant stand by the back door to wear when I go into the back yard. I have about three or four ‘spare’ pairs in a box. I bought four pairs instead of three not to long ago because the order total came with free shipping. Some of those spares are for my wife, who is really hard on sunglasses so I have some extra to give her when she breaks/loses a pair.
Bicycles. I think I’m done buying bikes, but at the moment I have two road bikes, a mountain bike, a fixie, and (half of a) tandem that are mine in the garage. There are also at least two bikes belonging to each of our kids (two kids) who moved out over a decade ago, and my wife has a few (three?) of her own. I’m not interested in different flavors of mountain bikes or a gravel bike, though.
Judo uniforms. I have five that still fit (three in my regular rotation), plus over a dozen that I’ve outgrown or are worn out that have sentimental attachments to them. At my age, they don’t wear out too quickly anymore, but I will probably buy one more special one if I ever get that next promotion. Oh, and I have one that belonged to my late brother that I keep in his memory.
Porsches. Got three, need to get rid of one. Probably should get rid of two, but it’s tough to let go!