Prints of art works are only as valuable as the cost of their manufacture.
The "cubism" created by Picasso was a newer form of modern art. His paintings are very valuable.
Where and when the piece of art was made are two very important facts to know. The medium of the piece is also valuable to know.
I am Istvan Porubszkys daughter Anna estranged. His many natural landscapes date back to late 50,s this must be one of his early works although they sold for substantial dollars in the early to mid seventies 2000 t0 20,000 the current market value I could not estimate but would also be interested as I have a number of his works.
I've never heard of John Friedlinger before. But, I do know that he was born in 1890, so his art may be valuable. The more beautiful pieces might go for over $400 or $500. You can always look it up at an auction website or something...
Hungarian/Canadian artist.
Istvan Balogh has written: 'Istvan Balogh'
Sandor Istvan Nagy's birth name is Nagy Sandor Istvan.
Istvan Kantor was born in 1949.
Istvan Teplan was born in 1958.
Istvan Rozanich was born in 1912.
Istvan Rozanich died in 1984.
Istvan Banyai was born in 1949.
Istvan Szil was born in 1961.
Istvan Horkay was born in 1945.
Istvan Pely was born in 1974.
Istvan Dugalin is 5' 7".