There are two basic shades ... Blue Green and Yellow Green. You obviously have the Yellow Green stamp. Printed by De La Rue in 1904 with Imperial Crown watermark. Your watermark is normal and not inverted. Not a valuable stamp but it is part of a set.
Colors according to Scott: Gray Green, Blue Green, Deep Bluish Green, Very Pale Bluish Green, Bright Green, Pale Yellow Green, Yellow Green, Dull Yellow Green, Dull Green. Good luck figuring out which is which. Paper variety and Perf. differences also must be checked. I don't collect WW so I don't really know which you have.
This halfpenny stamp has only one paper and one perforation type... Ordinary paper, perforated 14. The postmark looks to me to be 08 so that is a De La Rue printed stamp.
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