Somewhere around the forum, I recall a thread that helped date forgies based on the different logo stampings. That same thread gave some insight into quality based on time period. (In general, earlier were better grinds - I think). Worth searching out.
That said - from your pictures there doesn't look to be any pitting. That's the biggest issue.
I've cleaned up far worse looking ones with good success: Bar Keepers Friend, Flitz, and some stone time (maybe new handles if you like) and they turn into great cutters.