Hi Group, The "1929 Wurlitzer Military Band" catalog has the following
to say about the light bulbs:

  "To further set off the organ, the decorative front is wired for
  thirty-four 16 C.P. lamps, with an additional red lamp in each drum.
  These lights are usually furnished in red, white, and blue colors,
  and the organ makes a wonderful display at night."

Jack M. Conway, Los Angeles, California, USA

 [ See, for example, http://www.aamsco.com/Antique_1920.htm
 [ and http://www.lightbulbsdirect.com/page/001/CTGY/Antique
 [ -- Robbie