Tuff question, Could be many...leaves are cut deep,but way early photo. Try a search on acer palmatum 'Trompenburg' and see what you think.

Can you get some seeds or more plants from the parent tree? Not only would you have some trees for yourself, you'd have some for friends if you went the seed route. They are as fun to grow as they are to look at.
Evergreen trees and shrubs make good companion plants for Japanese Maples. They should be installed before the maples because they form the structure, or bones, of the garden.
Mike

hard to id JM's, i dont think its a trompenburg 9 lobed, your's seem to be 5 lobed.

if you're just looking for something that'll match you can try Bloodgood, Emperor 1, or Fireglow.

Thanks! I do know the original tree was grown in Wisconsin somewhere if that helps. This is the 3rd generation from what I understand (seedling of a seedling of the "parent" from Wisconsin).