Sorry, but the doubling on the reverse side is not from a doubled die. It's the common form of doubling, called ejection/mechancial/shelf/strike doubling. The line on the reverse isn't a die crack - it's a scratch. Die cracks are raised off the surface of the coin, and scratches (and struck thru's) are Into the surface of the coin.
Pretty much textbook md 'flat, shelf like and all in one direction' but keep looking there are doubled dies out there to be found and once you see one in person it gets easier to distinguish true doubling from mechanical doubling.
I have one but it won't load on my laptop so I now have to buy a new laptop. It's getting expensive for my new found hobby but I'm loving it I'm gonna keep this one made me so excited lol
