1931 (Oct 1) envelope sent registered to Switzerland with 1928-29 2c, 5c and 10c pair tied by Kuching cds with matching reg'n cachet adjacent, reverse with Singapore transit and Luzern arrival, small portion of backflap excised, fine. (Image)

1938 (Sep 19) envelope sent registered to Switzerland with 1934-41 Sir Charles Brooke 2c, 10c and 15c tied by Bintulu cds with matching reg'n cachet adjacent, reverse with Kuching, registered Singapore and Berne arrival, (Image)

1942, complete set from 1c. purple to $10 black and yellow, handstamped "Imperial Japanese Government" in violet, unused and almost all mint never hinged MNH in XF condition, cert. Scheller (2022), SG cat 5358£ for hinged. (Image)