Here is a lengthy thread to dig around in. SOTW badenia put together a history pile compiling numerous horns, serial numbers, and publications.
Hello Barry Tone, It is an Elkhart Band Instrument Co made soprano. It is neither Martin or Couturier. If you would share the serial number, I can provide a vintage estimate and model number. Since 2013 I have been researching the Elkhart BIC. I am nearing the volumes to publish an initial...
www.saxontheweb.net
Here is a good timeline by badenia from post #241 of that thread:
1) 1916 - CD Greenleaf (Conn Ltd) & AH Beardsley (Miles) buy control of Buescher, saving it from bankruptcy.
2) 1919 - CD Greenleaf & AH Beardsley incorporate the Elkhart Band Instrument Co as subsidiary of Buescher.
3) 1922 - 3rd Qtr EBIC begins making saxes only, including stencils, on Main St. Uses 50,000 serial numbers.
4) 1923 - Elkhart moves to Plum St.
6) 1926 - Buescher ceases stencils. All stencils going forward are EBIC models and serials. This may actually be 1928 as current serial systems seem to be in error for Buescher. Note: I am reviewing Buescher also.
5) 1927 - Late year a new EBIC serial system established ####-Yr.
6) 1928 - EBIC moves to Jackson St, into a new addition to Buescher Block (separate address). EBIC adds other band instruments to line. All stencils are EBIC models under its serial system and from its area of Buescher Block. EBIC becomes wholly owned subsidiary of Buescher. Note: prior to this the owners of Buescher also owned Elkhart. Elkhart shares were converted to Buescher. Contrary to popular belief there was no purchase or buyout.
7) 1929 - Mid year, Elkhart starts a new serial system at 1. Pan American augments brass line.
8) 1937 - Elkhart launches Windsor line - R serials.
8) 1942 - Mid year, Elkhart along with Buescher ceases consumer production for WWII. Windsor line ends.
9) 1945 - Late year Buescher reopens consumer production.
10) 1948 - Elkhart reopens. Engraving drops "Band Inst Co"
11) 1950 - Elkhart introduces "Built by Buescher" engraving.
12) 1955 - Elkhart changes engraving adding oval around Elkhead in Heart.
13) 1958 - Charles Greenleaf buys control of Buescher from rest of Greenleaf family after Leland takes reigns of Conn Ltd. Elkhart brand is dropped with Aristocrat carrying Elkhart serial numbers. There is some sax keying differences between these Aristocrats and those under the Buescher system.
14) 1960 - Elkhart brand dropped, replaced by relaunched Windsor brand under Buescher serial system as Windsor by Buescher, but uses EBIC as "maker,"
15) 1963 - Buescher bought by Selmer USA's Bundy subsidiary. The Elkhart brand is transferred but not used. Windsor ceases.