Pull the rifle out of the stock and make sure there is no corrosion under there. Some of the stocks were cured with salt water, and if so, there could be rust. Other than that, it's a commercial FN Mauser, (owned by Browning, no thumb cutout or stripper clip guide), and one hell of a rifle. There should be a fair amount of gold inlayed engraving on the action, trigger guard, and magazine floorplate.
As with all commercial Mausers from that era, accuracy should equal or exceed what you can expect from currently manufactured rifles.
Prices can go well over $1000 for showroom condition models. The Safari Grade was actually the lowest grade of this rifle. Much more money can be had for one of the High Grade rifles. If the stock has been replaced with another, that would detract from value significantly. Originally, it came with a very nice monte carlo style walnut stock. These guns were made during the 50's and 60's. Contacting Browning with the serial number would probably get you more detailed information.