Grape Vine Identification

[ItalianvinesinMN]

All, I sort of inherited a grape vine and I was hoping you could help identify it. The vine came by way of the female half of the house, and was a cutting from a vine at her mother's house. The story goes that the vine is from cuttings of a vine that were brought to the USA by her great grandparents when they came to the U.S. From Italy 70 + years ago. The transporters of the vine have long since passed away so all we really know is that it was a local vine for them that they brought over and that they lived near the city of Turin before they emigrated. The vines grow well in MN (which makes me slightly sceptical of a Mediterranean origin) and ripen in early September.
I've attached some pictures of this year's grapes that were picked yesterday, they're already a bit over ripe.

 

[ItalianvinesinMN]

In case it helps the skins seem rather thick and the grapes have 3-5 Seeds in every grape.

 

[sour_grapes]

I ain't no expert. But, based on the thick, slipskin grape with a powdery bloom, and the size and shape of the leaf, my money is on Concord (or other Vitis labrusca species, but I think Concord).

 

[cmason1957]

I am very far from an expert, but that was my thought as well.

 

[ItalianvinesinMN]

That would make sense given the climate back home (I'm quite out of town at the moment, so it's not my hand in the photo). The only thing that doesn't really match from what I can tell is that most descriptions for concord refer to the seeds being tightly bound to the flesh, but with these it's quite easy to separate the seeds and flesh with your tongue. They're in a sort of pocket in the grape and you press and they pop free. Not sure I explained that clearly, or it helps, but it's what I'm told.