What kind of acer palmatum is this?

Are you asking for subspecies or cultivar? Subspecies is hard to identify, but someone might be able to help. Cultivar is literally impossible, even for experts, without a label on the pot.

For what it's worth, it looks very similar to my small-seed green maples grown from seed.
 
Is it grafted? In not, chances are it is seed grown and therefore not any of the named existing cultivars. Or, to put it another way, every seedling is a new cultivar.
If there's no label it is Japanese maple.
So many similar cultivars that it is almost impossible to accurately name any just from visual cues and seedlings that look similar to existing cultivars make it even more difficult to pick trees just on visual.

That does not make your bonsai any less worthy or less beautiful. Please love it just as much as a Japanese maple.
 
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