It's a threadless fork with threadless headset. The NB-1 is looking pretty similar to the one I have. Frame has a Columbus sticker and takes a 27.2 seatpost.
To the best of our knowledge we bought the correct public transportation tickets, but some officer thought otherwise and charged us way to much for it.
Looking to buy a threadless ahead stem:
1 1/8 (28.6 mm) black/silver 120/130mm
If possible 26 handlebar clamp but 25,4 is also an option
Stylewise:
Salsa, Cinelli grammo, itm eclypse, nitto ui-2 etc.
Willing to ship