Royal Signals Collar Badges

[Shiny]

Hi All,

Following on from another thread where I was asking about the metal the Royal Signals cap and collar badges were made of, can anyone help identify what I have here?

I bought what I thought was an OSD pair of collars but now I have them I'm thinking only number 2 is correct.

I'm wondering if number 1 is a grubby standard OR's brass an white metal, number 3 is an officer's gilt and I'm not sure about number 4.

I have looked at this site to try and ID them but I'm not really any further forward:

http://www.signalsbadges.co.uk/framepage.htm

Any help would be appreciated.

Michael