In The Garden: Identify grape

We found a very old large grapevine on a beach near here. How can we get it identified?

 

Photos of ripe fruits with a size indication and perhaps photos of upper and lower surface of leaves would help.

 

Thanks for the reply. I have attached photos of the leaf and immature grapes.

 

An ID will be difficult without the ripe fruit. If those are recent photos, you may not get ripe fruit. All of my grapes are almost full size right now. If the grapes don't ripen this year, I would give up on ever getting a crop, because the weather has been exceptionally good for grapes.