1972.. I was 1 year old I agree with the date took a hit. Can you stick a pin under that tiny piece of metal and see if it bends upwards? If you don't want to try it that's understandable
I looked at it some more and from what I see the metal that goes from the 1 to 9 is on there solid. So if it was from a hit where did that metal come from?
nevermind I think I solved the puzzle. I just did a close up and see there is some metal missing from the one..if it's from the one though I wonder what hit it that fused metal together hmm one may never know