could be anything to be honest, those forks are very low end.......not many 1 1/8 forks that don't have disc mounts of some sort. They could be from late 90's when RST Mozo pro's and Rock shox Indies were all the go but they just look like cheap RST twin crown forks to me.
but it is pretty old as the frame has no disc mounts either, i'd take the forks off ans swap them for dome single crown ones as they could rip the head right off that ally frame