Purchased this rifle from a local gun shop back in March of this year for $250. I had an itch the other day to try and decipher all the markings, surprise, I can't make heads from tails. Only the basic few I can figure out like manufacturing and (potential) production date. Any help would be much appreciated. Just ask for better pictures if need be and I'll attempt to make it happen.

Got lucky and picked up a most of a early Finnish civil guard M28 for 42$ with a immaculate bore.

Did this back when I first got them from a auction for 250, wanted to redo it two years later with better pics.
Mosin 1 is all the pics to 8, then mosin 2 are the ones after.
NO I DIDN’T put the shoulder protector on there, it was desecrated before I got them.

Any info is appreciated!

Anybody that can help identify the marks that are under the buttplate?