The stock is definitely pre-WW1 commercial Mauser, with the swell on the sides, the rounded pistol grip and the slender tapered forend. I have two Type B's which have exactly the same stock, one in 7x57 and the other 8x57. The 7x57 has the same style floorplate as the .333, but without a release in the trigger guard. The 8x57 has set triggers and a floorplate with lever release. (Both are pictured somewhere on the forum in a long ago post). I really like the feel of the early stocks, especially the slim forend. The bolt knob on the .333 appears to me to be 'pear shaped' commercial and not the more rounded military style.

I think this rifle may just be an early Type B that was later chambered to .333 with some changes to the sights. However, if memory serves the .333 was introduced around 1905 so it would have been contemporaneous with the '98 action and the early Type B rifles.