The rarest and most valuable thing you own

I own one of the Gorillaz Kidrobot figures that were released in the mid 2000s, specifically CMYK 2D. Unfortunately I no longer have his box intact but he sits proudly on a shelf with my other Gorillaz memorabilia. I have a copy of their Rise of the Ogre book as well which goes for ridiculous prices.

I also own a large stamp collection i inherited from my uncle. I found some really rare stuff over there. I recently reorganized the stamps into a new album as the old one was falling apart. In addition to the album there is also a large box, filled to the brim with the rarest stamps imaginable...

There's two I have. The first is a doll I personally find creepy of the first visitor to Disneyland. My family thought I would like it since I am a big theme park nerd. I do not...not a fan of uncanny valley stuff.

The second is a small vintage doll representing one of the it's a small world figures. This I do like since its more cartoony than the doll of the real girl.

Found out i've got some more 360 games that are rare now like WET.

Figuring out what constitutes being valuable is a bit complicated.

Of the top of my head, a master copy of Agoni, an August Underground inspired SOV horror film, is probably the rarest thing I own. If not that, a vhs tape I've mentioned before that has hours of both Lamb Chop's Play Along episodes, but also local commercials, and PBS promos and bumpers. Given how long ago these were recorded, I highly doubt the original footage exists anymore in those affiliate archives and I haven't had much luck with finding anyone near me who also taped them (let alone likely remembers them).

I wouldn't say it's valuable but I'll tell you what it's definitely rare to find someone that owns a Iron Giant watch from a 1999 Honey Nut Cheerios promotion