If it’s got the original Venom stock you have got more than half a chance that the rest of the rifle is original. The American and Turkish walnut that is used today, by artists making copies of the original work is just different. Even the chequering that is done today tries in my opinion to be an exact copy. So that is not a guide to authenticity.The wood thought is it’s genetic fingerprint to be used to verify that the rifle is period as they used English and then French Walnut back in the day. If you bought a rifle off someone who could show that they had it 20 years or, so. That is great provenance, but buying from a dealer where it has passed through a few hands I would only emphasise Caveat Emptor.