After a bit more research Calvinism maybe worth exploring,firstly the 5 points of the movement are represented by the tulip,not the number of petals,but the first letter of the points themselves,there are the small classic engraved tulips on the glass and the larger flowers may well be as well,secondly the Calvinist awakening through Northern Europe and New England is dated to 1730 to 1740,the dates given by Antwerp for the glass,and lastly so far,the heart aflame in the hand of God,the symbol of John Calvin himself...this may explain the amount of engraving on this glass being driven on a wave of religious belief....feel free to shoot all this down,I have been known to be wrong on the odd occasion
