in view of what looks to be an impressed (in relief) mark, then this is pressed as opposed to the alternative suggestion of cut.
Pressed hobnail pattern goes back a long way, and was quite common earlier in the C20 - Davidson had massive success with their '1885 suite' (that was the date of first manufacture I believe), and items from that set can still be found. This form of decoration was also very popular as a cut design, and presumably it was the cut version that the pressed factories were copying.
Would agree, I can't really see this coming from a bottle factory, but you never know. Does it look French? - yes, possibly - for whatever reason my opinion is that it's not British. Rather unfortunate that with all the brains on this forum, we still don't seem to know who AB was/is, but it's a nice little piece