Does anyone know what model stem this is? Stamped on the quill next to the max height line is:

22.2 (0.875)
NITTO • JAPAN
U.0

I think it is "U.0" because the "O" in "NITTO" doesn't match, however I found a similar looking stem on ebay that was clearly stamped "U.Q" so maybe it is an "O"? I included below a photo of the front of the stem in case the shape is a cue.

Thank you for taking the time to read this!
John