CURRY PRECISION RENO NV L5 trumpet mouthpiece.
I have scoured the internet and cannot find any official information about the L5. A forum post from 2010 suggests that this is a "non-catalog" piece that had a "softer bite than the 5 or 600 rims."
The length is 3.52", cup width 1.07", and shank end .4".
I take returns within 30 days for any reason.