Sorry to disappoint, but the designation 'C' in front of D refers to "Concert [Model] D", as a piano in Steinway's stable of touring pianos destined to be used by Steinway Artists. These pianos are provided (shipped to the concert venue, then tuned and voiced) free of charge as long as the Steinway Artist allows the Steinway & Sons' 'double-S' logo to be displayed in concert, and that the Steinway brand is formally recognized in the audience's Playbill. Please note the top of the piano's hinged lid was "Stenciled" in white- or matte gold paint with the three-digit CD designation (in the form of a ~4-inch tall -- nominally 100mm -- CD XXX number becoming hidden from view after the hinged lid is folded open), but only the "D" designation was cast into the piano's iron/steel frame at the time the instrument's frame was manufactured; the CD designation was paint-stenciled at some later date by New York Steinway personnel (in "The Basement"). Steinway never casts a "CD" into its iron frame for its stable of touring pianos to be made available for loan to Steinway artists.
For example, Glenn Gould (*) loved to use Steinway "CD 318" (New York factory built in 1945 and discovered by Gould in 1960) until it was accidentally damaged (dropped perhaps?) in transit. Even after the cracked frame was repaired and soundboard replaced, Gould claimed CD 318 was never the same after the transit handling accident. As another example, CD 503 was Horowitz's favorite instrument to tour with him.
Steinway used a rather deliberate three digit CD XXX system of numbering their touring pianos. As older pianos were retired from Steinway's touring piano stable, they were replaced by newer ones with higher numbered CD designations.
Hope this helps clarify the "CD" designation mystery.
Cheers,
Joe
EDIT: (*) One can view the actual number '318' matte-gold paint stenciled onto the hinged lid of Glenn Gould's beloved CD 318 in the photo below:
https://postmediaottawacitizen2.files.w...&w=640
Last edited by jcfelice88keys (09-04-2018 19:15)