Bill, nice to see another New Jersey copper being found! I spent a lot of time trying to ID the variety, especially since my initial assessment had it as a Very Rare variety which would be special in my survey I am conducting, but alas, after having two experts look at the photos and one being inconclusive due to condition and the other one leaned toward a more common variety.
So after getting done doing my annual cherished duty of Income Tax filing I really got down to examining, comparing the photos and had to agree that your NJ copper is in fact a more common variety known as a Protruding Tongue type, but it is a Maris 16-L, The 16 designates the variety of the Obverse side (horse head and plow/date side) and the L designates the variety of the shield side. The J and L reverses are very very similar and on a worn, corroded copper that in photos does not always show all the necessary points of detail needed to be positive, makes for a challenge.
http://www.coinfacts.com/colonial_coins/new_jersey_coppers/maris_16L.htm (example of a M.16-L variety)
Congrats on getting one and if you got it in Delaware, all the better since not too many reported found in my survey from the 1st state!
Could you PM me the county and state found in so I can add that data to my circualtion pattern study? Your coin would be approximatetly the 455th one in the survey but only the 4th from Delaware if that is where you found it. Always looking for more by anyone who found them and photos always appreciated along with state and county found in.
Thanks
Don