Not Phil Atrill Greg. I've just compared it to a tall Horizon bottle signature and one on another later red stripey piece. Both ways up. They're not really comparable. None of my pieces have dates or numbers on. Phil Atrill is somebody I have followed since ~2005, when I bought a Distortion vase, (one of his first ones!) at the Scottish Glass Society Exhibition.
The work itself reminds me more of Jane Charles than Phil Atrill, but I don't think that's her signature.
I thought the number might read 1491?