UK Detector find - Any ideas, please?

I have this UK Metal Detector 'find' and I was hoping that someone more knowledgeable than I might have a clue as to what I have.
I have photographed the coin with different light sources hoping to bring out more detail. I would be grateful for any ideas, please?
(Apparently) AE17.3mm., 0.45gm. (Very thin)
(Side 'A')


(Side 'B')

 

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Charles the Somethingth from Somewhere.

 

Not much to work with but possibly a Charles I Farthing. Check out something like Seaby 3185

 

I think it’s a Richmond issue, but what type I can’t tell. I suppose you could use the position of the crown relative to the CAROL.

 

My badly drawn highlights.

 

I have just returned from hospital after cataract surgery.
I am 'blind' (bandages) so my wife is typing this.
I will be back in a couple of days.
Thank-you to all who have posted.

 

Wishing you a speedy recovery & cloudless sight!

 

Thank-you @Severus Alexander for your kind wishes.
Bandages off now and sight restored. (Everyone should get new lenses in their eyes - The world is so beautiful - one forgets.)

Thanks to @Milesofwho , and to @Oldhoopster , and to @Severus Alexander for the help in identifying this Charles I coin for me. Your input is much appreciated.
I am happy to describe the coin as :-
Charles I, 1625-1649 AD
'Royal' Farthing,
AE 17.3 mm., 0.45 gm.,
Richmond Mint
Ref: Sp.'98 3185

 

Here is more about it. I believe the author is a member of CoinTalk. Also, I believe you could probably figure out the privy mark on your example. https://oldcurrencyexchange.com/201...uide-the-richmond-patent-farthings-1625-34-2/

 

@Milesofwho
Thank-you for the link. I am off to there now to learn what I can.

 

You’re welcome!