“Grts”, in post card lingo, often refers to a card with “Greetings from…” on the front. The picture on the front of this card is some generic view of a river with a train steaming along it. When I looked, the railroad in Pennington doesn’t get too close to the Powell River, anyway. The overprint just ties it to Pennington, for tourism’s sake, you know. I would date this card to the late 40s, early 50s.
Uncle Bob's Pix 