Comment by scrough:
When UK HMV stopped issuing everything "expensive'' as "single sided only" in Dec 1923, almost all previous issues were recoupled to double sided. The DA/DB double sided series were issued from Jan 1924, as well as the various other D series of 'Celebrity' recordings. All the various HMV D series were 'International' and the foreign HMV companies could choose which to include in their catalogues. See the
HMV biog and the notes on the
HMV 1924 catalogue which now links to the copy at archive.org. Many foreign HMV companies had been issuing double sided since 1907, see notes at the end of the
Gramophone Concert biog.
Comment by han enderman:
HMV DK-105 - The HMV 1928 catalogue lists many Caruso recordings in the DA/DB-series, but also as early issues in other series, like DJ-100, DK-103, DM/DO/DQ-100. Caruso is listed in the "Red Label Section: A Library of Great Music, performed by Artists of International Fame". "This Section contains all (Double-/Single-sided) Celebrity Records" issued up to and including 31-12-1927. Then follows a list of these "International Celebrity Artists". Thus the DK series is only one of the special series. Last section of the 1928 cat is "Catalogue No. 2: Records of Unique and Historic Interest", which includes "many famous figures" in recordings "from early days" with recording dates from 1900-1922 (including Churchill speeches). HMV DK-105 is included with dates 1912/1915. So the intention of so many small opera series is not yet clear, but these are domestic releases. These series also occur on Italian Disco Grammofono (are these the original issues?).
Comment by JLC135:
According to Eddie Shaw's DATES book (Part 1), it was just a celebrity series.
Comment by Mike Gann:
I'm assuming this "D .K." series is an export series or not?