This has been one time consuming coin! I spent hours reading about it last night, then photographing it and getting the photos online and such. Today I borrowed a camera to try to get better pics and struck out. Then I tried the flatbed scanner and I think that's as good as we're going to get. Now I've made some composite pictures showing the suspect coin alongside a genuine nickel for comparison.
If I only noticed the wear and spot in the 'R' I would have my suspicions and set it aside until later. What clinches the idea for me is that the weight was significantly higher than 100% of the other nickels.
In all pictures the suspect counterfeit is on the left or the top, with a 1939 from circulation for comparison on the bottom or right.