I recently purchased a Winchester model 1894 (30-30). The only seriel # I can find on the underside of the gun in front of the lever action and it's1978. only four numbers would make it an original 1894 or 1895. The person I bought it from is 75 and has had it since his dad gave it to him at 15. So my question is " is that the right place for the seriel number and if it is how rare would that be?