SELETTORE PARTI BRACCIO DI INNESTO CONTROLLO MACCHINARI VINTAGE TORNIO GHISA NB97 L@@K?
Bottom reads: NB97. Possibly a lathe?. Has spring loaded adjustable steel pin with knob on top(see pics). Arm is 7 1/2" long with two offsets. Arm hole is approx. Also note. Not everything is perfect.