North London Group School of Nursing,Silver Nurses badge

A scarce Silver and enamel Nurses badge from the North London Group School of Nursing.It consists of the letters NLG in a red colour which I believe denotes the branch of training.I am unsure whether this is for Mental Health or Midwifery Training(if anyone can confirm I would be grateful)
The group covered the following hospitals;
Elizabeth Garrett Anderson Hospital
Royal Northern Hospital
Whittington Hospital
City of London Maternity Hospital
Friern Hospital
The badge is in very good condition with enamel good and pin,catch and safety roller catch in good order.Silver hallmarks for Thomas Fattorini,year letter for 1973.Height 26mm width 41mm.

Code: 51402