I was in daipers when you were in 'Nam and my Nikkormat was probably on the assembly line in Japan. I use the higher voltage silver battery and Ihave yet to replace it since I picked the camera up going on two years ago. I would get your Nikkormat Ftn CLA'd adjust it for the kosher batteries and start working that shutter with some B&W film. I am a huge fan of 1960's/early 1970's Nikkor lenses. They beat anything made today, save for Leica of course.