European oak identification

Benja

5 year old buck +
A friend contacted me this week asking for help to identify a young oak tree. It's a seedling grown from one of several acorns retrieved during some sort of ancestry/heritage excursion to Salm, France around 15 years ago. That's why we think it's a European variety of oak. This tree seems to be doing well here in zone 6a, but it hasn't produced any nuts yet.
Online oak leaf identification guides makes me think it's a Caucasian Oak (Quercus macranthera), but Sessile Oak (Quercus petraea) runs a close second. Can someone ID this tree? Do you have experience with Caucasian Oak?
 

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Looks like Quercus robur to me.
 
It doesn't look like my robur's leaves. All of mine produced acorns by 8-10 years old.
 
Thanks for your replies. I'll watch closely for acorns in the coming years.
 
It doesn't look like my robur's leaves. All of mine produced acorns by 8-10 years old.

They're highly variable, which is typical of my robur's leaves.
 
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