Got this picture from Anthony recently. I think the postmark is very nice and worth a mention, and is especially related to my post about the Kudat vs Kuching postmark here. The date in the Kudat postmark is 31 MAR 1911. I don't know how, but the stamps may have been kept for a while before being used in 1911, as the stamps are released in 1909 and overprinted in the same year just after 2 months. But the postmark is definetely Kudat, while the one I posted before was Kuching:

Sarawakiana concludes that the Kuching postmark on the stamp may be cancelled by favour on a previously dummy-cancelled N. Borneo stamps. Nevertheless, I think it's always nice to have both Kudat and Kuching postmarks on the same stamps for comparison...