Help to identify these 5 replicas

Hi!

I have received the following replicas among other coins and seem to be replicas of very old coins. I have no idea of how to identify them. Could you help me, please?

Coin 1:


Coin 2:


Coin 3:


Coin 4:


Coin 5:


Thank you in advance for your help.

Coin 5
OFFA King of Mercia (Spink 905)

https://en.numista.com/catalogue/pieces55844.html

I think the fourth is a replica of a First Millennium Coin, Silver Penny of Ethelred II. Can't find any reference on this site, but found this: http://24carat.co.uk/frame.php?url=reprocoinethelrediipenny.html

The first could be a replica of one of these (or something similar):

https://en.numista.com/catalogue/pieces66585.html

2nd coin: A replica of a Celtic Britain gold stater, possibly?

http://www.coinarchives.com/a/lotviewer.php?LotID=824483&AucID=1551&Lot=10&Val=a09d157ba1c40b5985f4745adb3630e8

Thank you very much for helping me. 4 out of 5 is incredible!

Let's wait if anybody has an idea for the third one before mark the post as solved.