not a clue - perhaps you should ask the Three Nuns

But seriously - if you look in Keith Vincent's 'Nailsea Glass', only one of the seventeen that he shows (page 42) has an everted upper bowl shape like yours ......... it reminds me of the 'thistle shape' found on some Scottish drinking glasses (E. & L. for example).
Most bowls showing in Vincent's book are shaped typical, with an incurved rim, and with the combed loops type of decoration
Since these things are - presumably - only every decorative, then you won't find wear, and will have to rely on finding a match (forgive the pun) somewhere that carries a date.
The general shape of yours Keith together with bobbins, flaring, curve and coloured rim are all features found on period pipes, although for all I know they may well have been made on and off since the early C19.
Very nice by the way.