Can't help with the markings. Value wise your friends rifle has no collector value since it's been sporterized and is only worth what it's parts would bring if broken down sold at auction. It would probably be worth more to someone looking for a cut down Enfield to hunt with than it's parts would fetch especially if the reciever has been d/t for a scope. It would be possible to restore it but that would most likely cost more than the rifle would be worth in the end, IMO.