I am not positive about the '16, it may be a reference to the year it was proofed (repeatedly) by the British, however it is a .303 - so it is a model/type/pattern p14. A 30-06 would make it the American issued p17. If you wish to semi-restore the reciever, you may want to find a volley sight on ebay for your disc, and a sporterized p14 with the sights still intact, and use it in place of the butchered one. The worse bubba'd p14, the better to the purists crowd. It would probally be easier, anyways. Cheers!
~Thomas