I spoke with a friend of mine who is a former SEAL and currently the Director of Firearms training in Langley. He told me that there may be been some 39/59s purchased by the CIA in the 70's, but he could find no record of that. He said there were many different weapons distributed to CIA entities at that time. Many purchase orders could have been made with S&W or any toher manufacturer from any of many "front" companies the CIA operated. Air America being the largest and most prevelent at the time of the Vietnam war.

In the museum at Langley there are a couple of 1911 .45's that were purchased with no markings of any kind. They were a contract, and those were sent all over the globe.

It's also possible that the model 39 was purchased privately by a CIA employee, since there wasn't much of a firearms policy back in those days.