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Woodworking: An entire log of American Chestnut.

About a century ago, the species was all but wiped out by a blight that came from Japanese chestnut. Some three billion trees died. The blight actually survives in the forest living on but not damaging oak trees, so American chestnuts are struggling to reclaim their historic habitats. The species is critically endangered and efforts to rehabilitate the population are underway, including trying to breed large surviving individuals or to genetically engineer blight resistant trees. Logging is of course completely out of the question.

American Chestnut is an excellent lumber, with many of the properties of white oak in a faster growing tree. It is straight grained, hard and strong, easy to saw and split, rot resistant due to tannins. A fantastic choice for indoor and outdoor furniture, structural timber, even telephone poles. Reclaimed chestnut timber from old buildings is highly prized, and what woodworker wouldn't love access to a few hundred board feet of freshly kiln dried American chestnut...if it was possible to ethically source.

In the typewriter community, the “holy grail” differs from person to person, but for me it was a 1930s Royal P equipped with a rare typeface called Vogue. Very, very rarely they’ll pop up from people who don’t know how significant that is, and that’s the only way to get one at a reasonable price - because those who do know what it is will ask thousands of dollars for it.

Eventually I found one for a comparatively cheap price (sub 1k), and the only reason someone else didn’t snap it up before I saw it was because the guy refused to ship it. Local pickup only. So I took the chance to drive the 10 hours round trip to snag it, and it sits proudly as the crown jewel of my collection:

Like the “real” grail, it doesn’t exist. A mutual standard and compatibility between aftermarket automotive components. IOW, if I’m building a car, I’d want a third party automatic headlight system to work with the backlighting in the instruments, the wiper controller to work with a stock steering column switch, the air conditioning to work with any temperature sensor and thermostatic control at all…. Yeah. You need to be a programming expert and have the ability to design a controller to get all these proprietary systems to function coherently. But instead it’s cadging together systems and trying to not make it clunky and distracting.

Also, gaming: the grail would be for abandoned games that require online servers to play are turned over to the gamers. Run your own servers and mods. Licensing servers can be contracted out to third parties, so you can still buy the game and a royalty is paid to the original studio, but they don’t have to maintain it anymore.

TTRPGs. A cleared schedule

Well, my hobby is searching for historical religious artifacts, so...

Designing small electronics:

Unlimited money for iterated prototyping and being able to afford 0.4mm pitch BGA fabrication and rigid-flex 😂

Maybe holy grail "Item" would be an expensive electronics lab with a very nice R&S scope and a nice soldering station with a trinocular microscope.

The Babel Fish

For example, in the headphone world, the Sennheiser HE-1 headphones are said to be like the pinnacle of headphones and most expensive, costing $59000 for a pair.

Edit: added image

Octanitrocubane

To celebrate the new millennium, German model train maker Märklin released a 1/87 scale electric locomotive with a body made out of platinum, with real rubys for the red taillights and other real materials such as windows made of real glass, wheels made of stainless steel and isolators of real ceramics. It's considered one of the most sought after railway models.

A rock

Elite Dangerous: the grail is the Fleet Carrier. Spent 7 years of non-grindy playtime saving up for mine.

My hobby is (or rather was) collecting Seiko watches.

I stopped buying watches, but my holy Grail would be "The" Pogue. The original 6139-6005 yellow face automatic chronograph worn by Col. William Pogue on the Skylab mission.

Other than the NASA issued Omegas, this was his personal watch that he just took with him into space, as NASA didn't want the Astronauts to take their Speedmasters home and so they couldn't train as much with them.

This also was the first automatic chronograph in space, as no one had tried before if they would work without gravity (surprise, they did, as momentum is still very much a thing in space).

Here is a very nice write up by a very knowledgeable guy:

https://www.plus9time.com/blog/2017/12/24/the-true-seiko-pogue-chronograph-6139-6005

I like collecting games, nothing crazy like graded games (graded anything is a scam) or like I have to have every game ever made for a specific console, I just like having a big shelf of games.

I really want a like new, in box green Halo edition original Xbox. People want stupid money for them but I just want to have one. I've got a good condition boxed regular black console and a boxed Halo 3 Xbox 360 but I reeeeally want the green OG.

Here's what people are trying to sell a NIB version for

I don't care what the other nerds say. This is the Holy Grail for me: