A "Devonshire class" cruiser, she served on the North America & West Indies Squadron from February 1916 until November 1918. Postcard published by W.G. MacLaughlan's Studio, 237 Barrington St., Halifax, NS.
Reference: Nova Scotia Archives Photo Collection: Navy: Ships: Carnarvon
Nova Scotia Archives — https://archives.novascotia.ca/royalnavy/archives/
Crown copyright © 2021, Province of Nova Scotia.