Acer propagation and identification help?

[acerbeginner123]

Hi, I've had this acer in my garden since I moved in 30 years ago. It's not changed shape significantly in that time and we've done nothing to train or shape it. It's around 7ft tall. I'd like to try to propagate it, and was thinking of air layering but have read some weeping acers can't be air layered? Any advice on how best to propagate it, and if possible what type it is would be greatly appreciated.