Norman Grant Silver Necklace

I'm very pleased to have added this pendant to my Norman Grant collection. With this necklace I was lucky to have been the only bidder, I immediately knew it was a Norman Grant piece, it is fully hallmarked but the seller hadn't put this in the description so I got it for a great price. The date mark is for 1972 so I think it's one of his earlier pieces. A friend said I could wear it on both sides and I have to agree. I think the pendant is of a fish with the eye in the middle of blue enamel and the outer eye green.
It's a large pendant measuring 5 cm in diameter.

Many thanks for looking