Hope Kuduae jumps in – untill then I'll give it a try

1st pic

N with crown = Nitro proof or semi smokeless powder
7,7mm = .318 caliber – older "I" Mauser not newer .323 "IS"
Now following numbers I am not sure about – one of them is date of make – either
2.13 (2.19) = february 1913 (1919) or 1 25 = january 1925
If 1 25 is january 1925 then 2.13 might be powder load in grams = 2.13 g = 32.87gr

4th pic

Crown with N = Nitro proof for rifled barrels

Upper line is bullet type – can't read but it might be one of the following:
St m G = Stahl Mantel Geschoss (Steel Jacked Bullet)
K m G = Kupfermantelgeschoss (Copper Jacked Bullet)
BI G = Bismuthgeschoss (hardened lead bullet)

Lower line is bullet weight (can't see) but guessing 11,6g = 179gr