Here is the information from the Wurlitzer Caliola master stencil
at the Herschell Carrousel Factory Museum:

 "Caliola, The Wurlitzer Waltz by Box, Cox, Gibson Roberts,
  cut by W Wurl, 0ct 5-1936, [roll number] 6083 [tune no.] 2.
  [roll number] 608? [tune no] 7, O K  B"

"B" or "Benz" and his "O K" are on most of our masters.  We presume
he was some sort of checker or final inspector before the master was
sent to the perforating room.

Doug Hershberger

 [ Composers Box, Cox, and Roberts also collaborated on songs like
 [ "I'm Singing a Song for the Old Folks", "Old Pal of Mine" and
 [ "Horsey! Horsey!"  -- Robbie