This is an old used black & white/sepia postcard of Loch Leven, posted in Perth on 15 December 1964 and the card still has the 2.5d stamp attached. It is a Valentine’s “Real Photo” Post Card, published by Valentine & Sons Ltd, Dundee & London, numbered D5035 and other than a little scuffing to some corners & edges, the card is in very good condition. 
(E198)