A Pentax MX that I had bought in a package deal with some old manual lenses, all in very poor condition, in Hue, Vietnam, had letters engraved on it's bottom plate. They were not clear enough to read but had my curiosity, I took macro shots and with some tweaking was able to decipher a name and city.
Garret Culhane's Pentax MX ;-)
, on Flickr
Searching the internet I found a photographer that goes by this name who even has his own photography related internet site. I contacted him and he told me that this really had been his camera, that he had received it as a Christmas gift from his parents in 1979. The photos taken in Africa and Nicaragua seen on his site had been taken with it.
He had been to Vietnam, there are photos on his sites he had taken there, but interestingly he told me that he never had taken this camera to Vietnam but given it, some 10 years earlier, to a charity shop in northern California.