Judging by the font type of the matrix number one can be assume that the records were manufactured by the Gramophone Company. This assumption is supported by the fact that the matrix numbers 17365b and 17368b of the first record, as well as matrix numbers 18251b and 18364b of the second record fall into gaps in the range of numbers from 17216b to 17449b recorded by Fred Gaisberg in St. Petersburg during his session of 03.14.1913 - 04/10/1913.
However, these records were never issued with labels Gramophone, they not even had been assigned with Gramophone catalog numbers - hence the conclusion is that the records were produced on special order.
Judging by the font type of the matrix number one can be assume that the records were manufactured by the Gramophone Company. This assumption is supported by the fact that the matrix numbers 17365b and 17368b of the first record, as well as matrix numbers 18251b and 18364b of the second record fall into gaps in the range of numbers from 17216b to 17449b recorded by Fred Gaisberg in St. Petersburg during his session of 03.14.1913 - 04/10/1913.
