Hallmarked: 9ct Gold 
Assay Office: London 
Date: 1979
Makers Mark: JLtd
Weight:  6.8g
Size: UK N US 7 EU 55
Width: 11mm
Due to width and how chunky the ring is, it will fit more like a L
 
Good clean Vintage condition.  Boxes in pictures not included. Resizing available