Yup, it has been hunted. A friend has been trying to sell it for $700 and has only had low ball offers ($500). A lot of folks are scared of the 300 Wby, but they're pussies as I shoot may 300 Wby w/o a problem. Does the chambering decrease it's value??
Some is Good---More is Better----Too Much is Just Right
The forearm is the No.1B beavertail type, should be a medium weight 26" barrel I would surmise. In factory No.1's, I thought the Weatherby was made only in the B version, barrel length type of thing; just my guess.
300 Weatherby is a hunting caliber, shoots hard and flat; but has some quick recoil that a lot do not like. Most guys that buy No.1's for donors kinda look at the action for 500, wood for 100 up. Barrel is usually a toss away. With that said, the platform can become whatever caliber you want with a rebarrel job. Rebarreling a No.1 has additional work for the quarter rib and clocking the ejector recess, kinda ala pre64 70, about the same labor but different; so the work is more time consuming($) than say a Savage or Remington bolt gun.
Just from the picture, 600 might get it in this community. Communities vary, so kinda one comment in a million there.
I'm kind of inclined to go with redz06 post. Might only go $550, just depends on how much clean up needs to be done on the wood and metal. The .300 Wby is one of the less common calibers AFAIK but condition and cartridge the gun is chambered in determines what the final price would be. For example, a #1B in .22 Hornet would command a much higher price than the same model in 30-06. With three #1 rifles in .300 Win. Mag., I can't see a need for one in the Weatherby. (One in the "B" version and two in the "S" model, one being a 200th year of American liberty model.) I love my #1s. Paul B.
Our forefathers did not politely protest the British.They did not vote them out of office, nor did they impeach the king,march on the capitol or ask permission for their rights. ----------------They just shot them. MOLON LABE
Around here $600-$700 would be about right. In better condition would bring a bit more. I have a No. 1B in .270 Weatherby Mag. which seems to be more scarce than the .300 Weatherby.
Some people are educated beyond their intelligence.
To answer your original question. From the picture the rifle appears to be a No.1B model. This is supported by the full forend, standard rib and what appears to be a magnum sporter weight barrel. The cartridge it is chambered in pretty much confirms this to be a No.1B.
With a 26in barrel it is well suited to being a 300 Weatherby. To tame recoil, a 1in Limbsaver recoil pad would help significantly - go with the grind to fit version as the No.1 woodwork is not as consistent as it could be and the pre-fit pads often look out of place.