Oh of course, in all honesty ID's on pieces like this can really only be absolutely confirmed by one man and sadly he is no longer with us! Indeed, I have used this board many times over the years gaining snippets of information and gaining more knowledge on the subject, but I agree, difference in experience will lead to differing oppinion.
I was slightly surprised when he told me, I associated broken pontils mainly with early IOW which is what i expected him to tell me it was. Elizabeth was next to him at the time and appeared to nod in agreement with the Mdina verdict but nevertheless either way its a wonderful piece of glass and my father won't part with it!
That is a real beauty, stunning piece, very jealous! He ID'd an early trial tricorn bowl which my Dad purchased from Ron, much wider opening than the conventional ones, even some pull marks where MH was trying out something but the glass had cooled too much!Not sure of the dating of it but i'd imagine 69 or thereabouts