I dont think i can add much, obviously if its M Ales signature on the base, then the date must be
earlier, there are a number of Bohemian glass experts on this board, maybe they will have a clue
to the J.P 44
In the book Czech Glass 1945-1980 Design in an age of Adversity, there are similar examples,interestingly
around 1944, some by Karel Hrodek, engraved below the decoration HK 44!
There are quite a few names in the book with initials J P, and also P J.
I think we need Marcus to pop in and have a look
(im a bit out of my depth!)http://sklounion.com/
(i believe i read he is away at the moment)
I will keep looking for clues until then,
ps, Trev, i have a few old bits of glass i need help with , so hopefully you can return the favour