Pre 1947 Silver Sixpences edge

[Romix]

Hello Dear forum members I am new here, 

Registered to ask people with more knowledge. Hope someone here can help me. 

Came across pre 1947 Sixpences with two different edges, why is the edge different, is one of them fake or you have an explanation? 

[Peckris 2]

Hi, Welcome to the forums   

It would help a lot if we knew the dates of those coins. My own thoughts are 

1) the "different" coin may be a high grade compared to the other 3, whose edges look pretty worn.

2) it's even possible that the different coin is a proof (is it dated 1937?), whose edges are sharp and crisp and even (I sound like good king Wenceslas  ) compared to currency coins.

Picture of  the reverse of all 4 coins would be helpful.