Resembles an old Kingsberry or American Classic hub. They were similar enough that one sued the other (I think Kingsberry was the first one). They have caps on the end which sit on top of a shorter main axle, press in cartridge bearings. Reasonably light, smooth. 18H, I think we used to use them when building first gen Zipp wheels (they sold rims only back then). The flanges were super thick so you could slot them for bladed spokes without voiding any warranty.

You should verify this before claiming you have a Kingsberry or AC hub but I think that's what it is.

cdr