Identification: Acer palmatum with green bark

Hey there,
I'm new to the forum and the first thing I do is asking questions ;P
My neighbours have this beautiful tree but nobody really knows what kind of maple it is.
I enquired at Esveld, other forums and even the gardener who had planted the tree could not help me because he had planted it more than 10 years ago.
I love the green bark with its stripes (like 'coral bark' but green!). Other barks become corky with the time.
Is it a normal green A. palmatum, 'Aocha nishiki' , 'Ao yagi' or maybe something completely different?

Here it is:

 

I can't answer your question exactly, but I can tell you it is definitely not 'Aoyagi'; that one will never have any red on the leaves or petioles.

Welcome to the forum!

 

Thanks for welcoming me =)
Are there any characteristics that make the identification easier?

 

Hard to say. Leaves look like generic palmatum, but bark looks like a beautiful shade of green.

 

Maybe this helps:
The leaves are yellow-red in spring (as seen in the pictures above) and turn into dark green in late summer (as seen below) but I don't remember what autumn color it has...
It has red flowers but I have never seen any fruits. Maybe it's sterile?

Sorry for the bad quality. It was a windy day ;)
Edit: Photo is from last year