Bob: You're very welcome. And thanks to our mudelf for all the trimmings and sorting out!
As per the wiki footnotes the earliest date for the company is Stinson's own 1946 ad copy on the occasion of their '30th Anniversary' expansion:
“Stinson Celebrates 30th Anniversary in Disk Biz
NEW YORK, May 25. – According to Herbert Harris and Irving Prosky [sic], the Stinson Trading Company, Inc., is planning a large expansion in connection with its 30th anniversary as a phonograph record manufacturer.
Company has purchased the interest of Moe Asch, but will continue to produce recordings under both the Stinson and Asch-Stinson labels.”
[Coin Machines, Billboard, 1 June 1946, p.102]
...and, so far, nowhere else is it mentioned again until the mid-1930s. Coincidence or not, 1916 is the year Charlie's father Charles P. died.