As Latvian WW2 collector. I want tell you a little bit about Latvian rings. Text below describes how to recognize early or late Latvian ring.
So, the oldest of all six rings - ring #4 (unused and unworn). Why? Because this ring has only two signs of wear/die stamp defects.
The next will be ring #1. This ring also have two signs of wear/die stamp defects, but there is also the beginning of the third track.
Next will be #3 and #5, they have three signs of wear/die stamp defects. But the ring #5 is little older, as signs of wear/die stamp defects them a little less. (this is particularly seen on the signs of wear/die stamp defects #1)
Well, the most "young" rings are rings #2 and #6 - they both have four signs of wear/die stamp defects, but judging by the signs of wear/die stamp defects ring #2 a little bit younger than ring #6.
P.S Information and photos was given to me by my friend who also collects Latvian and other volunteers items. I'm translate it to you