There are some websites out there that tell you the make and year of old shotshells. Based on the narkings on the base, etc. I found an old base shotshell a couple of years ago that was from the late 1800's to early 1900's. It was a 10ga
The primer is an early Boxer or Berdan type, you can tell which by looking into the shell and seeing if there is one flash hole or two. That's going to make it a fairly early shell, pre 1900 anyway, but I can't find info at the moment on when the modern 209 shot shell primer was introduced.