Medieval silver coin identification please

I have been given these cuff links recently they appear to be silver and have the words. s’andree Nichola, 1337, Copiret, Rigsarkivet. Which I believe to be Danish. Does anyone have any ideas. Thank you

The coin has been hammered around a back-plate so the wording on the back will likely be the name and address of the jeweller.
The image on the coin is that of the Norwegian King, Olaf II Haraldsson, who reigned 1015 - 1028, died in battle in 1030 and was canonised as St. Olaf (traditionally known as St. Olave) in 1031.
Not much, but it's a start.

Thanks very much for the information.