This machine is often found labeled as a LADA. It was made in Czechoslovakia the early 1950s. It is a wonderful machine if working properly. Most reports on this series of machines say that the internal timing belt is usually found to be disintegrated. Turn the hand wheel and watch to see if the hook turns. If not, the belt is shot. You can also check the belt itself by removing the handwheel (one screw). The timing belt is no longer available. The new belts have a different pitch than the two old gears on the machine.
I replaced the belt on mine about ten years ago. I bought new Riccar replacement gears. I had to machine a sleeve to reduce the inside diameter on one gear and machine out the other so they would fit the shafts. Then after finding a belt that almost fit, I had to install an idler pulley to take up the slack.
Basically gear and belt replacement is not for the faint of heart.
Cathy