that's not a rifle, that's a submachine gun.
The Soviets made something like 10 million of them during and after World War II.
They were, like the AK-47 some years later, very liberally distributed to Soviet satellite states and can be found worldwide.
US/UN troops faced them in Korea and Vietnam.
Value - hard to say given that you're in Lebanon and the laws are very, very different. In the United States, our laws, and the very limited supply of these weapons, conspire to drive the prices to well over $10,000 for the last couple of years.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.