The card was dated 1970 — at least the photo — and was mailed in 1978 with 13-cent stamp and Rochester postmark.  Serrated edges.  Unusually, the caption doesn’t say where the hospital is, despite calling it “one of the largest privately owned hospitals in the world,” and we know from a quick search that it is now part of the Mayo Clinic.  Dexter Press card 15X-DT-68284-C.  Grade: 1