I looked at the image and that coin is a close AM . [ATTACH]
clash .
The one listed on john site is a thin date . Yours is a thick date ....
Try to match it to one of these . http://varietyvista.com/12%20Kennedy%20Halves/DDRs%201969-D.htm
Mechanical doubling .........
I'm not seeing it . http://varietyvista.com/09b%20WQ%20Vol%202/DDR%20Detail%20Pages/1966PDDR001.htm
http://www.lincolncentforum.com/plating-split-doubling-split-line-doubling/
I'm still wondering who said it was, class 2 doubling ....
Separate names with a comma.