There are so many Enfields coming from Afganistan and other parts of the Empire that pricing is getting to be a tricky thing to estimate. Since the rifle has been in your family a long time you can rule out the Afgan supply. Look the stock over carefully for stamped markings expecially behind the trigger guard and on the side of the stock. They can be small. The markings you have already described are proof markings stamped on the barrel durning assembly of the weapon. A picture would be nice.