Can anyone identify what this is?

[outlinegm]

My grandmother left me this years ago. I just found it in an old box. I think it's a silver pendant to do with celebrating the Royal Family in some way.

 

[PreRaphaelite]

Here’s a guide to the hallmarks. Have fun!

Gold Hallmark Identification Wizard

Identify the hallmarks on your gold using our free hallmark identification wizard.

www.gold-traders.co.uk

 

[VRBeauty]

Actually, you might want to start here:

https://www.assayofficelondon.co.uk/hallmarking/what-is-a-hallmark#convention

Hallmarking at the Goldsmiths Company Assay Office in London. Where Hallmarking and Assaying began. Laser and Traditional marking methods. UK and Convention Marks.

www.assayofficelondon.co.uk

this might also be helpful:

London Date Letters

 

[Eclectic]

1977 Queens jubilee hallmark pendant

VINTAGE 1977 SILVER HALLMARK PENDANT INGOT QUEEN ELIZABETH SILVER JUBILEE 15.5G | eBay

HALLMARKS ARE FOR 1977 THE YEAR OF THE QUEEN'S SILVER JUBILEE. IN GOOD USED CONDITION, FULLY HALLMARKED. I WILL SEND IN A CLOTH GIFT BAG.

www.ebay.co.uk