Never seen these hubs before. Tried some online searches to no avail.
32H with a 10sp Campagnolo freehub configuration, so from early-00's.
Shown with Zipp skewers. Uses some nice carbon fiber dustcaps. No markings, whatsoever.

Slightly dusty shot. These cleaned up nicely.

Do you all think maybe American Classic?

Does it really matter? It either works or it doesn't. If you already have it, then use it if you have a purpose for it.

Perhaps it works so well for the OP that he wants to obtain another set, and needs to know the manufacturer/model.

Additionally, here’s a suggestion…in your pics, there appears to be a bit of surface corrosion on the axle part of the hubs. If there is a manufacturer’s logo etched/stamped into the hub, it might be lite/fine enough that the corrosion is covering it. I can’t tell in your photos what direction you took them from, and you may know this, but generally wheel builders align the rim and hub so that looking through the rim valve hole, you are looking directly at the hub manufacturer’s logo. So, if you can get the corrosion in that precise area cleaned off…you might find it.

Dan

Perhaps. But we really won't know for certain if the OP doesn't say. Will we?

Just got home from a long & mountainous ride.
Never realized any BF requirement to explain why I wish to know the hub brand.
Well, here goes: I plan to sell this near-mint wheelset. Potential buyers likely wish to know the brand.
No rust or corrosion anywhere. The Campy titanium cassette - which will sell separately - looks like about ten miles wear.
Photo taken haphazardly with my iPhone. I use a digital SLR for the eventual ad pics.

The rims that came with it might narrow it down some. Or not.

Did some further online searches to determine, with some confidence, that Zipp actually made these hubs.
It appears in their early days, they did not stamp or decal some of their products.
Never saw a rear with the same holes on the driveside flange, but some other pieces matched Zipp's stuff.
The wheelset looks very nice, using DT Swiss rims and bladed spoke 3-cross rear and 2-cross front.

Yeah, the holes in the DS flange were what threw me. Distinctive, but also not obvious what brand did it.