Very old AT diamond marker

[springerfever]

Thought ya'll might enjoy seeing this AT marker from quite a few years back. Any idea on what years this particular design was used ?

The picture with the various markers is, I believe, chronological from the very first markers. The one I have is top row/far right.

[hubcap]

Pretty cool piece of history. If you don't get an answer here, check with the AT Museum.