Welcome to the message board. Just judging from the catalogue illustrations and descriptions in Tran Duy Ly's book on Sessions clocks, Sessions issued a few so-called "bim-bam" strike tambours in the mid-1930's (seen in Tran from the 1936 catalogue). Bim-bam refers to the double, or two-tone strike of the hours, as indicated on your label. Tran does not show your particular clock among those in his book, but it certainly would fit in with that "series." And note the "10-38" stamped on your label. Possibly October 1938, which again would be consistent with the 1936 catalogue illustrations in Tran. I also note, FWIW, that the label on yours calls the strike a "Two-Tone Chime," whereas we normally would call it simply a two-tone strike, reserving the term "chime" for a tune, such as the Westminster Chime. I guess we shouldn't be too insistent on what we call it.