1. On the clarinet, serial numbers appear on the back of the body of the instrument, on either side of the socket rings where the upper joint meets the lower joint, or close to the bell. Serial numbers on oboes are usually seen on the back of the instrument, in the middle where the joints meet, or close to the lowest key, near the bell.
2. Most likely your horn was made in Elkhart. Most Pan American models I have seen used a P in the serial number. One thing I noticed is that the Conn serial numbers in 1917 started around 40,000. Conn also introduced the New Wonder line in 1917. So here's my theory. Conn wanted a seperate list of serial numbers for their Pan American line.

Conn 444n Is Similar To: France 25413 Conn Bb Buffet Vintage Clarinet French Wood Selmer (43.2% similar) The bell sports a Conn 77 logo and no other markings and I'm unaware of any Conn clarinets that were french stencils. Obviously please ask questions and i'll check things, make other photos and follow up with you. That apart, the instruments are the same, as are the serial numbers. Serial numbers as at the start of the calendar year. Benson Bell Currently, Ben and four employees produce an anticipated 15 to 20 bassoons per year.

Between 1968 and 1974 Buffet also made the Super Dynaction Bb clarinet.
Few of these are known in existance though they seem to have a low demand
due to their jazz heritage.

Conn Trombone Serial Number Chart

Evette Master models with the cutout under the RH crow feet are the
identified R-13 rejects.

Conn Bass Clarinet Serial Numbers

Approximately 1990 Buffet changed their lineup.

Pre-1990

Pro to Beginner: R13 (Pro) – C12 (Intermediate) – E45
(Intermediate) – E11 (Beginner) – B12 (Beginner)

Post 1990

Pro to Begginer: R13 (Pro) – E13 (Intermediate) & C12 (conservatory
intermediate) – E12 (Intermediate) –
E11 (Beg) – B12 (Beg)

C-13 (aka International)
is the equivalent to an E-11 but it was manufactured as a “private brand”
for another US company

Buffet E-13 Clarinets

Buffet Harmony Clarinets