Maybe at one time, or now, all doctors and their staffs were stamp collectors.  From time to time we run across cards like this one, bulk-mailed (but with real stamp, real postmark) from a foreign country by drug companies marketing thir products.  This one went to a doctor in New York in 1958 from Abbott Labs, selling Pentothal Sodium, an anaesthetic.  His name is on an address label, and someone has written the name of the country in red ink at bottom reverse.  Grade: 4