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Karabiner 98 (wartime production), Yugoslav M48A, Argentine Modelo 1909, Swedish M/96, and Brazilian Mod. 1908.
If you're referring to the Argentine Modelo 1909, it uses the 7.65x53 cartridge... a rather uncommon round, but surplus ammo can be found for them. On the side of the receiver, it should say something like "MAUSER MODELO ARGENTINO 1909", while the bolt guide behind the chamber should have the manufacturer's markings.. on mine, it says "DEUTSCHE WAFFEN-UND MUNITIONSFABRIKEN, BERLIN", although there were a couple other locations where these were manufactured. Also, on the top of the chamber, there should be an engraved crest.
50-500 USD
Find a gunsmith and ask for help
50-200 USD or so
Not knowing how many variations of the Chilean Mauser were made, or which variation you're referring to, the assumption will be made that you refer to the Mod. 1908, which was a variation of the German Gewehr 98 Mauser. This stock, and stocks of other variants (such as the Argentine Modelo 1909) should have some degree of interchangeability with the Mod 1908, although it is possible that some sanding or other minor alteration will be necessary.
$15 to $40 depending on condition.
No sn data published I know of.
Unaware of any published sn data.
Two types of 7.65 pistols were manufactured.. depending on the date of manufacture, it would either be the 7.65x21 Parabellum (which was replaced in German service by the 9x19 Parabellum), or it may be 7.65x17SR (which is sold commercially as the .32 ACP). Mauser manufactured pistols in both calibers.If you're referring to the Mauser rifles, what you have is probably one of the Argentine Mausers (they made a number of different models, with the Modelo 1909 being most common). These were manufactured in Germany for the Argentinians, and fire a 7.65x54 cartridge. Surplus ammunition for this rifle is a bit uncommon, but still can be found if you search in the right places.
No SN data published. Year of manufacture should be engraved on the crown.
Depends on condition and originality. Anywhere from $100 to $275