A photo of the painting plus a close-up of the signature might help.
I notice that you posted a message earlier this year about the same painting, and Wayward had a few words of caution, which were wise. However, you did give more information in that last post, such as the stamp on the back saying 'Republic of Hungary'. This is interesting as Hungary didn't become the Hungarian Republic until 1989, prior to that it was the People's Republic of Hungary,and there haven't been any wars or revolutions there since then (the last one being in 1956), but it may just be that they didn't bother with the full title. Also, I'm not sure why a painting that hung in a gallery or museum would have that stamped on the back.especially in English, so, a photo of the stamp might also help a little.