The Brunei International Airport cancellations are probably not that easily available commercially. They are best appreciated on cover. I do not have D1 yet. The following are philatelically inspired bearing the name of a well known writer and collector of Brunei material. I have also included D5 from a previous post.
D2 which was in use for a few months between 1974 and 1975.
D3 which was in use in the second half of 1974.
D5 which was used between 1975 and 1983.