Hiya - thanks guys. Rare in the sense that they are no longer in circulation and therefore not legal tender. I know many were made at the time though.
yeah when I filtered eBay to items that had actually sold, it seems they don’t go for more than £3-£10 unfortunately.
oh well….
Your picture is too blurred for comment but here are my own pictures from my website:
Single exergue with waves almost touching the line and double exergue with waves clear of the line.