Postcard Frye Sanitarium & Bath House Platt Nat. Park, Sulphur Oklahoma Unposted - The corners and edges of the postcard are slightly worn. Please see the pictures for more details. The size is approx. 3.5" x 5.5". I take high-quality photos and scans of my items. Please use the eBay picture zoom feature to see the full details and condition of the card.