The 75 c stamp has a W18 watermark and a slight nick at its base. SG254 CV£7.5

The mint 1c stamp has a crown CA watermark

The 3c stamp on the top row has previously been identified as having a crown CA watermark. It is indistinct but may be a multiscript crown CA watermark

All the stamps on the lower row appear to have a multiscript crown CA watermark, though on some of the stamps the watermark is indistinct.