One really great thing about those Brazilian mausers, the head space and chambers are identical. I've picked up a few in the past and if they're in VG or better condition, the same load with the same OAL and they will shoot into less than an inch at 100yds. An interesting aside, the Brazilians loaded a 140grn bullet at 2900fps.
There were a lot of beautiful sporters made on those actions as well as the barreled actions. For a very short while in the early seventies pristine barreled actions were available for $75. That was a pretty hefty price in those days, considering you could buy a complete rifle kit from Sherwood, including stock, 98 barreled action, drilled and tapped with the charger guides ground off,adjustable trigger, aluminum trigger guard, sand paper etc for about the same price. Admittedly some of the actions left a bit to be desired.
Those early Brazilians were gorgeous. They shoot as good as they look and all of the parts are perfect. The triggers are beautifully crisp and let off right at 4 1/2 pounds.
hnchaj, bayonets are available in the $100 range in excellent condition, give or take a few dollars. The finish on that receiver looks to be slightly stained as well and the safe kisses would require refinishing the stock, therefore lowering the value. I think the $350-$400 price tag is in the right ball park.