your girlfriend is 108 yrs old? How old are you?? This isn't one of those May-December romances, is it?
....Oh, well, true love will win out...
Mausers are called Mausers because of the guy that designed them... Peter Paul Mauser..... and you thought he just made candy bars.... I'm not really sure what his first design was, but one of the first big successful Mausers was the 91 series...which are called "small ring" Mausers, because the reciever ring is smaller in diameter than the 98 series rifles, which is by far the most common today. The small ring Mausers include Swedish 96's and 38's in 6.5mm, otherwise known as the 6.5x55.. and various others including Mexican mausers..95's? I can't remember...but they are 7mm, or 7x57. Yours sounds to me like a Mexican mauser, but I couldn't tell you without inspecting it... it is probably a 7mm. There were also 91 Argentine mausers in 7.65x53, I believe. Most of the 98's, or "large ring" mausers are chambered for the 8mm, or 7.9x57...but they are normally just called 8mm's... You should take it to a reputable gunsmith or gunshop and have them check it out...the older guns should have the headspace checked, and should be thoroughly inspected for rust or cracks. Checking headspace isn't a difficult task, and the cost shouldn't be more than 15 or 20 dollars, if that much. That having been said, if it is in ok condition, you have a REALLY nice rifle... chambered for one of the best deer cartridges made. Good luck with it.... hornetguy