Starting with the New Wonder series, horns were identified with a number and a letter. In the case of the saxophones, the letter is "M" and there are a lot of numbers:

20M Straight Eb Sopranino (Conn called it an "Eb Soprano")
2M C Soprano
4M Bb Soprano, Curved
18M Bb Soprano, Straight
22M Conn-O-Sax
24M F Mezzo Soprano
6M Eb Alto
8M C Melody Tenor
10M Bb Tenor
12M Eb Baritone
14M Bb Bass
(16V Eb Contrabass Sarrusophone -- Conn's Eb contrabass sax replacement)

An even number was for a LOW pitch (modern intonation; A=440hz) horn. Odd numbers were for HIGH pitch (obsolete intonation standard; A=457hz). "H" or "L" is stamped by the serial number. High pitch saxophones cannot be made to play in tune with modern instruments.

Finishes were referred to by number. Especially note that the 0 was for standard gold-plated finish, the 00 was for the ARTIST'S SPECIAL gold-plated finish with "special" engraving (from about 30 different choices), and the 000 was for the VIRTUOSO DELUXE gold-plated finish with additional pearl key touches and custom, one-of-a-kind, engraving.

The patent number 1119954 and date (Dec. 8, 1914) are for the William S. Haynes patent for drawn toneholes. It's not when your horn was made.

Below is a link-list of some offsite galleries and specific New Wonder links I've found. If you've got some info and want to list it here, drop me a line at Matt Stohrer Misc. Galleries Misc. Info.
8M s/n 97782 (1922) Silver
6M s/n 188000 (1926) Nickel
6M s/n 199000 (1928) Gold 0
6M s/n 225000 (1929) Gold 00
6M s/n 238458 (1930) Silver
10M s/n 246000 (1931) Gold
6M s/n 246116 (1931) Gold
6M s/n 238458 (1930) Silver
1931 Warranty Booklet
6M Transitional Saxes
Repairman's Overview Vids
1935 Sax Care Booklet
Tenor Prototype
WWS: 00 and 000 Horns
WWS: Our Finest
1923 16V Silver
ca. 1923 16V Brass
1923 8M Gold Plate Virtuoso + Article
1923 8M Gold Plate Virtuoso
1925 10M Gold Plate
The Conn Microtuner
Sarrusophone Fingering Chart
Restored 16V Video
Another 16V Video
50th Anniv. Sousaphone (Gold 00)

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