1859 Cent Pc59-621 Group "L"

I've shown three of the four reverse groups Dr. Haxby has determined consist of a single die in earlier threads.
Here is the other one which is listed as group "L" PC59-621 Obv.62 paired with Rev. L1.
This die has the distinction of being the only one where they repaired the vine at L7.
I do have this die pair in better condition but choose this coin because of the late die state resulting in many die cracks.
Dr. Haxby has identified twelve reverse groups in total, four of the groups being determined to have a single reverse die.
The following is a list of the four groups and I've rated them as to the difficulty in finding. (My opinion only)

Group "L" Second easiest to find.
Group "M" Most difficult to find.
Group "N" Second most difficult to find.
Group "O" Easiest to find.

Acquiring one from each of these four groups puts you well on your way to collecting one from each group, the other eight groups can easily be acquired.
Thanks again and all comments welcome.

Cheers, Bill