Identification: ID Help Needed

Greetings,

I'm wondering if anyone can ID this Japanese Maple Cultivar. It's been growing in a Nursery row for about 10 years but has lost it's lable & the owner asked me if i could ID it for him but could't.

Summer leaves are large (up to 5") & green. The dark red margin, yellow fall color was uniform on the plant.

Thanks!

 

Might be a seedling.

 

I thought that too at first but I don't think so as it's been grafted.

 

A 'matsumurae' of some kind ?...