British West Africa - One Penny 1920, no mintmark? [решено]

just picked up this coin but cant find a mintmark "H/KN" on it? even through a microscope?
mintmark suppose to be below hole (if present) but not listed on Numista without?
Identification please  

 Looks like the top of the H there. I circle in yellow ...
                                   

 On the right is the same part of the coin, to match yours, which I rotated and cropped from ...
https://en.numista.com/catalogue/pieces5792.html

Цитата: ZacUKLooks like the top of the H there. I circle in yellow ...
                                   

 On the right is the same part of the coin, to match yours, which I rotated and cropped from ...
https://en.numista.com/catalogue/pieces5792.html

Thanks! could be but will have to have a closer look again. most of the surface has dents and scratches. Very difficult to see. Is "H" suppose to "stand out" or engraved?

another photo from a different angle...

ZacUK was correct. It's Heaton mint, but "H" is almost worn off.

I also agree with Zac.

I have enhanced your image and layered the numista image on top with enough transparency to see exactly where the mint mark should be.



reversing the colour tones with numista image layered on top




you can just about make out the H mint mark when I enhance the images by reversing the colour tones on your original image, which allows for finer detail.

I have circled it here, just like Zac's example.






I would be able to enhance the images much better if I had higher resolution images to work with.

Thanks all for your expertise! much appreciated!