The cruiser was launched in 1905. This card dates from around 1910. The cruiser was lost in a U-boat-laid minefield off the Orkney Islands on June 5, 1916. 643 men, including Lord Kitchener – on a diplomatic mission to Russia, were lost. Twelve survived.
The front shows some fading but the overall condition of the card is very good. Apparently, it was kept in a common picture album. The browning on the back is probably from the acidic stock of the album pages.
The Prudential Insurance Company issued quite a few postcards around this time, but this one could be an R3. It’s available on the web for around $20, in mint condition.