This SRS series duplicated some of the numbers used. This record was released as No.35/36, but another record was released (R 3132 by the Teddy Wilson Trio) also as No. 35/36 in Sept 1948. R 3132 was later probably renumbered as No.57/58 of the series. See http://www.concertinas.org.uk/AncientAudio/RS-1947+V1.pdf for listings of the SRS series from 1948 onwards.