Only 15,000 Mauser M.1891 Argentine carbines were manufactured by Ludwig Lowe, so it's relatively easy. If the serial number is A0000-A4999 or B0000-B4999 it was manufactured in 1893. If the serial number is A5000-A9999, it was manufactured in 1895. Although 30,000 carbines were originally ordered by the Argentine military, it appears that these 15,000 were the only ones delivered.
10-1000 USD or more depending on specifics
$275-$450, depending on EXACT model and EXACT condition.
It may not even fit an 1891 Mauser. Bolts are not a "drop in" part- they may require fitting (headspacing) to that individual rifle. That is where a gunsmith earns his pay.
7.65x53, also known as the 7.65 Argentine or Belgian.
50-500 USD
Find a gunsmith and ask for help
They made those from 1890 to the early 1900's
50-200 USD or so
it means that u did a big poo
Gun shows, e-gunparts.com, want ads.
$15 to $40 depending on condition.
Depends on condition and originality. Anywhere from $100 to $275