There are a good number of plate varieties for the late printings (the 1L's), all easy to spot.
Here I have a page for these
There are two types of long scratches ver the melon, and for each I find many.
The two I find the most of, and I think are found on the plate on more than one position are:
Small diagonal scratch between the two outer lines midway across the bottom:
Large dot on the lower outer edge of the central design, midway
Interestingly, my favorite variety for the this stamp is a printing, and not a plate variety, and it is the doubled center variety, which, to my surprise, is NOT a very rare stamp.
my favorite variety for the this stamp
There is also a remarkable plate variety on the unwatermarked grid stamp, the 2pNGR, which I luckily also have on cover!