Help me. The feature of some coins of the United Kingdom

Hello. In some coins of the United Kingdom, I noticed a strange feature of the edge. It is observed in three types of coins:

½ Farthing - Victoria 1st portrait - https://en.numista.com/catalogue/pieces8480.html





2 Pence - Victoria 1st portrait; Colonial and Maundy issues - https://en.numista.com/catalogue/pieces13207.html





4 Pence - Victoria 1st portrait; (Maundy issues) - https://en.numista.com/catalogue/pieces8478.html





All three types of coins were issued at about the same time, and they were made by one engraver - William Wyon. Can anyone suggest a history of this feature? Or write where you can read. Please!

Best regards, Edward.

Interesting. I didn't know about this. I will have to check my coins...

In the early 1860s the Royal mint did a great deal of modifications to coinage experimenting with border design until they adopted the standard one and it looks like these are a part of that process and it seems they issued them into circulation

Цитата: "Camerinvs"​Interesting. I didn't know about this. I will have to check my coins...

​Well, what is the result?

Maybe it is used to differentiate between denominations

Lack of consistency in die production.

There is a version that this is protection against counterfeiting. A peculiar micro-font of the 19th century. But the version has not been confirmed by anything. And I want to get accurate information.