Greg Black 1 Piece Trumpet Mouthpiece

New York Model 2S
Rim: Wide Throat: #27 Cup: Shallow Bowl
Inside Diameter: 16.3mm/.641in Outside Rim Diameter: 1.116in

Slightly larger rim diameter than the NY1. Comparable to 7C inner rim diameter. 

1B 1 Rim Shape: Medium Wide  Cup Diameter: 17.3mm/.681" "B" Cup Depth: Deep Standard bore option on 'B' cups is a #26

10 Rim Shape: Medium Wide Cup Diameter: 16mm/.630" "C" Cup Depth: Medium Deep. Standard bore option on all  'C' depths mouthpieces is a #27