Read the Otto Link mouthpiece Reviews here, various posts:
The Woodwind Forum
1930s Buffet – Evettine in top scroll – Buffet emblem below lower ligature
These 2 Buffet C Crown mouthpieces are from different generations.
Unfortunately I forgot which was from which. One is from a 1974 R-13, the
other is an earlier model. The distinct differences are that  one has a
slightly longer beak;  one throat wide is wider,  and the C and the
crown are spaced dfferently
C Crowns are apparently made from Chedeville blanks
1974 – This 1974 model has a close C and crown, and wide though not as wide)
throat as the other model. Centered and good tonal quality.
Mouthpiece Gauge (see top part of below)