Well... as it so happens, I am a former NIS SA... now it is called NCIS. I remember being in the office one day in the late 80s and we got a shipment of NIB Model 19s that had been somewhere in storage. We were asked if we wanted them as issue weapons. Nobody spoke up, as none of us really wanted an issued weapon (we mostly had purchased our own, such as my Model 66). The 19s were 4" blue and gorgeous. At that time, they did not have ONI stamped anywhere on them. Also at that time, our SA credentials DID have the words ONI on them, but they removed that when they issued us new credentials when the name changed to NCIS. Unfortunately I cannot remember whether these 19s had square or round butts.
Roger
(former SA, NCIS)