Help Russia 1908 Issue Types

I'm classifying some Russian stamps from the 1908 issue. I've looked at the Michel and Solovyov catalogs, and I'd appreciate your help in guiding me on the different types.

So far, I've divided them into two groups: those with a watermark and those without. Then, among the ones with a watermark, I've separated them into those that seem to have horizontal mesh, vertical mesh, and no visible mesh. Additionally, in two of them I can see the lozenge pattern from the front.

From what I understand in the catalogs, the horizontal mesh would correspond to the first issue, the vertical mesh to the second issue, and those without mesh and without watermark to a third issue.

In short, I need help—any advice on how to classify this issue into types?

I don't know if this will help, it will be easier if you posted some pictures. To separate the early from the later issues, look for the arrows over the post horns, the arrow issues are the later ones. I used to collect Russia and they are easy to get mixed up.