I would pronounce that "ay two one seven nine". A505 would be "ay five oh five" but A610 would be "ay six ten". But I wonder if that's because I'm from a part

I would pronounce that "ay two one seven nine". A505 would be "ay five oh five" but A610 would be "ay six ten". But I wonder if that's because I'm from a part of England where the first digit is large (>4). I can see A1066 is more likely to be "ay ten sixty-six".