Claude, don't think it's the Denon releases. The ones I have include yearly lists in their liner notes and there is not gap in the catalogue numbers.
Must be from another Japanese Savoy reissues series.
But these look the same, no? And the numbering is similar or the same, either, no? I think these Denons were distributed all over, not just in Japan, as most other Japanese reissues (JRVGs, TOCs).