Comment by han enderman:
Br 2374 - I have saved images with these
dealer stamps when I saw them on (mainly) ebay. They are occasionally found with other labels and then omit the ☆Licensed Brunswick Dealer☆ statement. I have lower/upper texts:
OK 40517 - Licensed OKeh dealer / Arcadia Book & Music Store, ..., Arcadia, Florida
Co A-5426 - Chicago, Illinois / Sold by Wade-Twichell Co., 311 So. Wabash Ave.
PA 020547 - Pianos & Music Rolls / Charles Wolf, 115 N. Cicero Ave., Tel. Austin 2084
In the Brunswick main popular series (2000-) I have them in range 2008-2420, 2766, 5000-5185.
In other series on 10037, 13019, 35000, 30022, 40001, 50011.
Not in Br 100, 7000 series.
Locations are Phoenix, Arizona; Los Angeles; San Diego; Ft. Worth, Texas; Minot, N. Dakota; Fredonia, Kansas; ...merton, Washington; Utica, NY; St. Joseph, Mo.; Cairo, ...; Waukegan, Ill.; Panora & Perry & Waterloo & Manchester, Iowa; Beloit & Oshkosh, Wisc.; Elgin, Ill.; Oakland; St. Louis, Mo.; Moberly, Missouri; Connersville & Huntington, Ind.; Charlotte & Reed City, Mich.; Melrose Park, Ill. (Br 2766); St. Paul & Hopkins, Minn.; Lafayette, Ind.; Little Falls, Minn.; also Ziv Furniture Co, West Division Street (no city).
An ad "Free advertising for wide awake dealers" is in TMW Nov 1922, showing as example Br 2264. I'll upload it here, to illustrate the discussion.