Those 1899-1906 issues of Duttia (second stamp) can be quite difficult, and differences in scanners don't help!
However, I think that the stamp is not SG 16c, the lake shade. This

is probably closer to the 'lake'. I believe the stamp belongs to the rose-red/pale rose family, SG 16a/b, like this

Duttia State is a fascinating, but expensive, study. SG 38 (the 1920 rouletted ¼ Anna blue) sheets, for instance, came with the top right impression missing.

Must have played merry hell with the PO clerks booking up their stamp sales at the end of the day ...