These cancels are from HK stamps used in the treaty port of Amoy.
The 4c stamp is SG Z58 (watermark Crown CA); the 4c Multiple Crown CA wasn't issued until a year after your CDS date. In good condition it catalogues at GBP3.25.
The 50c stamp could either be SG Z65 or Z79, depending on the watermark. Z65 has the Crown CA watermark, Z79 has Multiple Crown CA watermark. In good condition, Z65 catalogues at GBP120, whilst Z79 catalogues at GBP42. Both these watermark varieties were in circulation during the time frame of your CDS date. The image on the 50c isn't too clear but it looks like the NE corner is badly damaged. This will massively reduce any potential value if this is the case.
Thanks for the info, appreciate it. The stamp has a bit of a curl to it, its not flat and some photo trickery. The corners are luckily fine. Also its not clear byt its the 30 cent. Value on the 30c please?
Are you sure it's 30 cents?? That stamp is dull green and black. Your photo shows a stamp which is dull green and magenta, which is the 50 cents value. The numerical value is obscured by the cancel.
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