to me it looks far too pink to be sun purpling - the effect of ultra violet on manganese, I think. Agree with Sue as to similarity with Schrotter's Lord pattern (called 'Jacobean' when Clayton Mayers marketed and sold it in the U.K. ), but have a horrible feeling that other manufacturers also made similar patterns with these windows/lenses, and I remember Pamela commenting once that it was difficult to tell the difference between pieces made by different factories. Inwald apparently made this range in amber, rose pink, blue, green, clear and of course carnival, so always a chance this one might be from the Lord/Jacobean range, and think I've seen most of these colours except rose pink - so this bowl might just be that colour. According to Andy McConnell, by the mid 1930s there were no less than 275 separate Jacobean shapes available.
Not too sure about the comments re pressed and crystal though - as Sue's link states clearly, Glenn Thistlewood commented way back that the early pieces made in Czechoslovakia had mirror-like bases (at least where the glass was flat), whereas U.K. made pieces lacked shiny bottoms. There is still acres of Jacobean around in Charity shops - I saw a water jug this morning carrying the name - so the pattern must have been made for a very long time.
Sorry, none of which helps, but this is an attractive bowl.