My first camera was Kodak Instamatic X-15F, a gift from my grandfather some time in 1977. It took 126 cartridges. I remember the yellow box it came in, and on the back of the camera were three small square indents where you could place your initials using the sheet of letter stickers that came in the box. I was so proud to personalize the camera that way and was very careful to put the stickers on straight. Pretty cheesy, really, but not to a nine year old!
I have most of my early negatives, but they are hard for me to date precisely. The one below is of my little brother, so I think this must have been around 1978-79. Image scanned from the negative. (Image of the camera courtesy of Wikipedia.)