What is the most coveted GPK item ever? (Holy Grail is over-used)

[GPK GEM MINT]

What GPK of any kind would be the most in demand?

A pair of game-used John Pound "Pounded Underwear"?

A Tom Bunk signed "Birth Certificate" of his son Derek Berlin?

A Final of Adam Bomb?

Any ideas of what could be the most loved and lusted over GPK item of any type?

[dxtc]

OS1 Adam Bomb Final
OS1 Nasty Nick Final
OS1 Dead Ted Final
OS2 Fryin’ Ryan Final
OS3 Hot Head Harvey Final
OS3 Joe Blow Final

just some contenders real quick.

[Broodwich]

Brown Pencil if you ask Jimbo IIRC

[creamedkeith]

Unopened case of OS1 - weren't there rumors about that a couple years ago!? But yeah, any of those finals!

[cameron.fown]

I would say it is what is valued by a collector more than anything. For some it is bootleg, for others it is that one character, but for most I think it is getting a complete OS 1 set. Most collectors have this set or a start.

[Buyatari]

OS1 Adam Bomb final