Sarawak Stamps Used in Brunei

Look at the stamp on the left. What do you see?For the uninitiated, you will see a Sarawak stamp. But not realising that this Sarawak stamp was postmarked in Brunei. Brooketon was the former name for today's Muara. Unfortunately the year is not very clear, it was 96 (1896). In those days, Rajah Brooke was the concessionary holder for the coal in Muara (what do you mean you did not there was coal