I agree that this seller is very legit (I just opened another envelope from him with 6 more wins) and I bid on many of his variety coins.
Currently I'm the high bidder on this coin and if I win I'll update on the coin.
I agree that the .// penny is often mistaken with the more common .//
At least 2 of the other 4 .// pennies on
ebay are .// (if you see a .// penny with a die clash then it almost certainly isn't a .// penny but a .//) as I have scores of .// and hundreds of .// pennies and have only seen the die clash on the .// (the majority of .// pennies have 1 to 3 die clash marks between the NN).
There are about 10 die marker diagnostic markers on genuine .// pennies spread over the obverse and reverse (most need very fine louping to find)