I think I may have just found a 1970 s small date. It's kind of hard to tell in this pic, but the 9 appears to curve pretty sharp towards the 7. Tell me what y'all think.
It's a large date. You'll find the difference in the shape of the "zero", then you'll know and see the real difference. The large zero is wide open and even line across all four numbers, whereas on the small date the zero is more confined and the top is below the horizontal line.